Questions tagged [transition-metals]

For questions about the characteristic physical properties, chemical reactions, etc. of d-block elements, group 3-12, or their compounds. Do not use this tag if your questions is about general properties of metals, use [metal] instead. Also see [rare-earth-elements].

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Is the Trans Influence Truly Thermodynamic or part kinetic? If the starting complex is raised by a strong σ donor, won't the products be raised too?

I am a little confused about the trans influence and trans effect, but mainly the trans influence. I think I understand the trans effect as certain ligands being able to better stabilise the ...
KKH's user avatar
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Factors deciding whether acidic / basic character dominates in an amphoteric compounds

In my NCERT textbook, in the chapter 'The d- and f-block elements', the last paragraph under oxides and oxoanions of metals goes like: $...$ $\ce{V2O5}$ is, however, amphoteric though mainly acidic ...
Chem-geek0's user avatar
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2 answers
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Why can't group 2B metals (Zn, Cd, Hg) form complexes with ligands such as CO, nitrosyl (NO), and olefins but do from complexes with NH3, CN- etc?

Why Group 2B metals (Zn, Cd, Hg) can form complexes with Ammonia ($\ce{NH3}$), Cyanide ($\ce{CN-}$) etc. and not with ligands such as carbonyl ($\ce{CO}$), nitrosyl ($\ce{NO}$), and olefins? What I ...
Bilal Malik's user avatar
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Existence of (anti)perovskite (Cs+)3(Pt2-)(Au-) and (Cs+)(Ba 2+)(Au-)3

I know that there are oxide-aurides of cesium and rubidium from wikipedia and https://www.researchgate.net/publication/243821351_Cs3AuO_the_First_Ternary_Oxide_with_Anionic_Gold and that the component ...
user144669's user avatar
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How is the electronic configuration of elements determined practically? [duplicate]

How is the electronic configuration of elements determined in practical? Theoretically, we use certain rules (Aufbau principle, Pauli exclusion principle, and Hund's rule) to define the electronic ...
Bilal Malik's user avatar
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1 answer
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D-d splitting in transition metal ions

Cu+2 ion has total of 9 electrons in its 3d orbital. When it undergoes d-d splitting an electronic transition can take place between t2 and e as in {Cu(CN)4}-2 complex because of the presence of one ...
Tabi Khan's user avatar
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How to regenerate indium wires for vacuum seals?

I have a setup consisting in a vessel that eventually gets at low temperatures (approximately 85K - 87K) and needs indium wire as sealant. Unfortunately, we have to frequently open and close this ...
frappesco's user avatar
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Why does the nitrito ligand have a higher Δo than water in the spectrochemical series?

I collected some data to determine the value of $\Delta_\text{o}$ for a some transition metal complexes (attached) and I'm very confused as to why $\Delta_\text{o}$ for the $\ce{ONO-}$ ligand is ...
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Transition of electrons between t2g and eg to give colour of coordination compounds

In the case of a hexaaquairon (III) complex, the iron (III) ion has 5 electrons, each singly occupying one d orbital. As the d orbitals are occupied, the vacant 4s, 4p and 4d orbitals are hybridised ...
Tabi Khan's user avatar
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Why exactly does copper have a higher melting point than zinc?

It is said that copper has a higher melting point than zinc because of the d electrons in copper being involved in metallic bonding. However, copper has no unpaired electrons in its d subshell just ...
wonderingwhy's user avatar
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Physical significance of electrode potential for M^2+/M where M is a 3d series d-block metal

What is the actual meaning of electrode potential of $\ce{Cu^2+}$/$\ce{Cu}$ having a positive value? Does that mean that the reaction (i.e. $\ce{Cu^2+ + 2e- -> Cu}$) will want to happen more ...
calcandquant's user avatar
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Jahn-Teller Distortion: How to compare magnitudes (in Cu2+ complexes)?

Octahedral complex of copper(II) undergo structural distortion (Jahn-Teller). Which one of the given copper(II) complexes will who the maximum structural distortion? (en - ethylenediamine) (A) $[Cu(...
magneticMono_Poal247's user avatar
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2 answers
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Does ferrocenium chloride ([Fe(C5H5)2]Cl) exist as a stable compound?

I am interested in using ferrocenium chloride ($\ce{[Fe(C5H5)2]Cl}$) for a synthesis application, but I couldn't find any sources referring to its existence, even though some websites and a figure in ...
psansoldo's user avatar
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Effect on Metal-Phosphine Bond if Metal centre gets oxidised

Looking at the Octahedral complex, the chromium is a $d^6$ complex and, if the Chromium bond gets oxidised, it will have lesser electrons to donate to phosphine's $\sigma^{*}$ orbital. This effect is ...
DocManIM's user avatar
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Why does the answer given consider octahedral splitting even though there is no specification of the complex

My textbook (NCERT Chemistry Part 1) gives this question as an example: Why is $\ce{Cr^2+}$ reducing and $\ce{Mn^3+}$ oxidising when both have $d^4$ configuration? And the solution given along with ...
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Deriving population of $t_{2g}$ orbitals in transition metal oxides

I have recently studied ligand field theory but there is one thing I do not understand. Consider an octaedral geometry of ligands around a transition metal with a $t_{2g}$ - $e_g$ splitting of atomic $...
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Can someone help with GAMESS input files for heavy atom calculations (MoS2, WS2, etc.)?

I'm doing computational research on transition metal dichalcogenides for my chemistry class and I want to calculate a transition state optimization for the reaction $\ce{MoS2 +N^- -> MoSN + S^-}$. ...
Daniel's user avatar
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Why don't Zn, Cd, Mn and Hg have more than one metallic structure at normal temperature, while other d-block elements do?

It's been given in my book, that "With the exceptions of Zn, Cd, Hg and Mn, they have one or more typical metallic structures at normal temperatures." But, why this exception?
saromitha kumar XA mem's user avatar
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What's the reason of curvature in Tanabe-Sugano diagrams?

Analysing Tanabe-Sugano diagrams it's evident that some of the lines are pretty parallels to that of the ground field whilst others are inclinated or have some curvature. I know what's the effect on ...
Chemistry.'s user avatar
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Do the paired electrons of subshells' degenerate orbitals contribute to the total exchange energy?

For instance, in d7, there are 5 electrons with the same spin, and 2 electron with the opposite spin, meaning that there are only 3 unpaired electrons. So, which of these would be correct? (i) Total ...
Ayushi Kaushal's user avatar
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Why is iron(III) more stable than iron(II)?

What I have seen, and what has been answered before (Why Fe 3+ is more common than Fe 2+), is that it is due to the half filled d orbital of $\ce{Fe^3+}$ compared to $\ce{Fe^2+}$. I don't understand ...
Ariichu's user avatar
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What is happening in experiment coating a copper coin with zinc and turning it to brass?

Today in class we did the "gold penny" experiment, where we put metallic zinc and a penny in a zinc chloride $\pu{1 M}$ solution at $\pu{100 °C}$, which caused the penny to turn silver as ...
anonymousaga's user avatar
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2 answers
159 views

What is the oxidation state of atoms in interstitial transition compounds?

My teacher said that even though interstitial compounds are neither ionic nor covalent, we still define an oxidation state for them. The example she gave was $\ce{TiC}$. She said the carbon is in $-4$ ...
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If gold does not oxidise in air, why doesn't it reform it's lattice?

It is a common fact that without oxidation, a metal can reform it's lattice with a tad bit of pressure. Gold is often said to be non-oxidising(doesn't oxidise in ambient temperature and pressure) and ...
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Why does Cr have higher melting point in the 4 period among the transition metal? [duplicate]

There is a lot of answer stating that the low enthalpy of atomisation in Cr is due to the reason of partially filled d orbital, thus having extra stability. This makes the orbital more attracted ...
Satyadarshi's user avatar
1 vote
1 answer
181 views

Crystal Field Splitting for a d0 metal ion

Its well-known that crystal field splitting occurs because the electrons in d orbitals repel incoming ligands and the d orbitals are no longer degenerate. My question is now: is the repulsion (with ...
whitingsheep's user avatar
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What is the shape of tetraamminenickel(II) complex?

I have basic knowledge of crystal field theory (CFT) and how to predict geometries in complexes with a coordination number of 4. For $\ce{[Ni(NH3)4]^2+}$, we find that the metal center, $\ce{Ni^2+}$, ...
sushant_padha's user avatar
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1 answer
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Significance of Character tables in d orbital splitting

When we have a molecule say (Co(NH2)6) hypothetically any octahedral molecule it has the point group of Oh and the character table shows the quadratic function such as ($z^2,2z^2-x^2-y^2$) ($xy, xz, ...
Harshdeep Chhabra's user avatar
2 votes
0 answers
39 views

The electron structure in transition metallic bonding [duplicate]

Copper has an electron structure of $\ce{[Ar] 3d^10 4s^1}$. In salts it may form two stable ions, the $\ce{Cu^+}$ and $\ce{Cu^2+}$. (It's actually not very clear to me why the 2+ ion is common, why ...
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Trend in formation enthalpy of metal fluorides

Please see below for the data I am referring to. I don't really understand why the trend in Cr ceases and reverses. I think I understand what the logic for WFn is - while the cost of forming Mn+ ...
Bartholomew696969's user avatar
1 vote
0 answers
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Why do the successive ionisation energies of Ni and Pt diverge?

The data I am referring to is below on the graph. The explanation I have found is that the 5d orbital of Pt is more diffuse than the 3d orbital of Ni, so is less sensitive to the increases in Zeff as ...
Bartholomew696969's user avatar
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163 views

Theoretical explanation for: Why is KMnO4 stronger oxidizing agent than K2Cr2O7?

I know that it can be explained using the Reduction Potential values. But, can it be explained from their structures or something like that ?
Mr. Chemist's user avatar
3 votes
1 answer
265 views

Can I convert copper(II) acetate or carbonate to copper(II) sulfate?

I am a high school student who does chemistry as a hobby, and as such I really don't know very much. I managed to make some copper(II) acetate and copper(II) carbonate, and now I'd like to convert it ...
Tanner Nelson's user avatar
3 votes
1 answer
3k views

Why do Mn and Tc have lower melting points with respect to their immediate neighbors but Re doesn't?

Manganese (Mn) and technetium (Tc) show a sharp decline in their melting point in comparison to the neighboring transition elements, which is unexpected while following the general trend which says ...
Uzzion Pathak's user avatar
7 votes
1 answer
4k views

Creating resilient (non-brittle non-water-soluble) verdigris (blue-green copper patina)

First off, I checked and there are indeed a number of questions on copper patinas, but none which deal with resilience. Context I own a number of copper writing utensils, which I'd like to get a nice ...
TheChymera's user avatar
1 vote
0 answers
38 views

How to get Raman shift frequency values from neutron scattering measurements?

I have read some papers that say that a Kohn anomaly mode is a particular feature of 2H- transition metal dichalcogenides and that the existence of such a mode can be seen in neutron scattering data ...
John's user avatar
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4 votes
1 answer
503 views

Lower melting points of zinc, cadmium and mercury

I am aware of the fact that d-block elements like zinc, cadmium and mercury have lower melting points than other d-block elements. Also I am aware that these three metals have a fully filled d shell. ...
Shashaank's user avatar
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3 votes
1 answer
194 views

Nichrome alloy corrosion at high temperature

We are currently using a nichrome (80/20) wire based heater to surround a sample chamber that we wish to heat by radiation. Maximum sample temperature is 400degC in an atmosphere of air that may be ...
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Why middle elements of transition series show more number of oxidation states [duplicate]

Why do the elements in the middle of the transition series show more number of common oxidation states than others?
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Why is nickel anticorrosive?

I've been looking into corrosion and common ways to prevent it. Pure nickel seems to be the main anticorrosive material to use, but I can't find a decent answer as to what it has/does that other ...
cass's user avatar
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4 votes
1 answer
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Why does berkelium have two electronic configurations?

J.D. Lee Concise Inorganic Chemistry, Appendix E: Electronic Structures of the Elements [1, p. 601] provides two electronic configurations for berkelium: $$ \ce{Bk}\quad \begin{cases} [\ce{Rn}]~\...
Aayush Srivastava's user avatar
1 vote
0 answers
1k views

How many multivalent elements are there? [closed]

According to this video there are 20 multivalent elements, and from the periodic table, I see 20, but according to multiple websites, including this, it says there are only 5. What am I not ...
Abdullah's user avatar
0 votes
1 answer
125 views

Store Palladium Chloride in Solution

I have one gram of palladium chloride ($\ce{PdCl2}$) and I want to use very small quantities of it, in milligrams somewhere. It is not possible for me to get my hands on a scale that can measure that ...
Umer's user avatar
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1 answer
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How do we know the ionic charge of iron or elements such as iron on the periodic table?

How do we find iron's ionic charge? I was taught that we use roman numerals but I don't see any on the basic periodic table of elements (I'm using this one). So how do we find iron's charge of Fe 2+ ...
Abdullah's user avatar
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1 answer
329 views

How long does it take for zinc oxide powder and heinz vinegar to fully react into zinc acetate at a 1:2 ratio of zinc:heinz vinegar? [closed]

How long should I leave a solution of zinc oxide powder and heinz vinegar in order for it to react as completely as possible? The solution is 1(zinc oxide powder):2(heinz vinegar) in a glass flask. ...
tomatopies's user avatar
3 votes
1 answer
614 views

Can you oxidize gold using only oxygen?

I keep reading that gold does not react with oxygen, but I also see information about gold Oxides (ie: aurous oxide, Au2O and auric oxide, Au2O3) Knowing that there is a way of getting gold oxide ...
Tolure's user avatar
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Why is AgOH brown when silver(I) ions are colorless?

As Wikipedia states, $\ce{Ag+}$ ions are colorless in solution: https://en.wikipedia.org/wiki/Color_of_chemicals Compounds that I know of containing $\ce{OH-}$ are also colorless or white (such as $\...
ernogal's user avatar
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Is hydrochloric acid or sulfuric acid more corrosive to titanium?

Which acid is more corrosive to titanium at 20 to 30 °C and similar concentrations: hydrochloric acid $\ce{HCl}$ or sulfuric acid $\ce{H2SO4}$? I found some info on AZoMaterials — Titanium - Corrosion ...
Cagdas Ozgenc's user avatar
5 votes
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Does chromium(III) oxide react with or dissolve in liquid sulfur dioxide?

Liquid $\ce{SO2}$ (b.p. −10 °C) is known as a versatile solvent (yet not particularly pleasant to work with) for a wide range of organic and inorganic compounds having limited solubility in ...
andselisk's user avatar
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How to safely alloy magnesium castings into aluminum?

I want to dissolve previously sand cast magnesium to molten aluminum to create an aluminum magnesium alloy. Of course I want to do this as safely, and inexpensively, as possible. I have an electric (...
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