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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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Why can we see color during d-d transition of electron? [duplicate]

As we know that when a ligand approaches the transition metals, the d-orbital loses its degeneracy and in this case electron can jump from lower orbitals to higher orbitals adsorbing the visible light....
XotEmBotZ's user avatar
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76 views
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Does zinc form any sulfosalts that are not reactive to chromium?

If extremely fine chromium powder is made in a ball mill under inert gas atmosphere, is it possible that adding a sulfosalt of zinc to this process yields a mix of these powders without reaction with ...
Paul Kolk's user avatar
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2 answers
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Why the colour of complexes is the complement of light absorbed? [closed]

From crystal field theory, the splitting of the degenerate $d$ orbitals gives the opportunity for electrons to be promoted, and therefore absorb some light. The colour of the complex is then ...
whdwqbe2eb12's user avatar
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Stability constant of transition complexes

Consider the equilbirum constant $K_{stab}$ for transition complexes. Why does this equilibrium constant omit water from the expression? For other equilibrium constants, I understand that water is not ...
2qnei2q's user avatar
5 votes
1 answer
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What is less coordinating to metals? Triflates or hexafluorophosphates, and why?

I saw a reaction where $\ce{AgOTf}$ and $\ce{AgPF6}$ were used, but I am trying to discern the reactivity between the two silver salts. I read that triflates and hexafluorophosphates are both non-...
MrAmateurChem's user avatar
2 votes
0 answers
32 views

Sensitivity of CoSi2 to hydrogen

It is known that palladium is quite sensitive to hydrogen, i.e., has an extraordinary ability to absorb hydrogen. I was reading a paper that talks about the fabrication of a Pd based sensor for ...
mathemania's user avatar
3 votes
1 answer
87 views

How to make the energy level diagram of dichlorodiammineplatinum(II)?

The oxidation state of platinum in $\ce{[PtCl2(NH3)2]}$ complex is $+2,$ so its configuration will be $\ce{5d^8 6s^0 6p^0}$ and the shape will be square planar. But this complex has two strong field ...
Code Crox's user avatar
2 votes
2 answers
93 views

Choosing a transition metal catalyst instead of iron catalyst to investigate the degradation of methyl orange?

I was working on a dye degradation project for methyl orange (MO), using Fenton's Reaction. I plan on keeping a constant pH of 2. Normally, the reaction is done with an Iron catalyst, but at lower pH ...
Ronith's user avatar
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4 votes
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Why does the 1st ionisation energy decrease from the 9th period to the 10th period

I’m currently looking at the ionisation energy chart within my chemistry textbook and while I know that there are not really meaningful periodic trends within transition metals, generally the ...
Dale Yang's user avatar
2 votes
0 answers
78 views

Does copper(II) hydroxide dissolve in ammonia solution?

According to University of Oregon — Chemistry Interactive Demonstrations and Educational Resources — Copper-Ammonia Complex, the equilibrium constant for the formation of copper(II) hydroxide is ...
Shira's user avatar
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Binding energies of transition metals in the 3d series

Binding energy of the transition elements in the 3d series increases up to vanadium then drops from chromium to manganese and then increases slightly and then drops again It is seen that binding ...
Tabi Khan's user avatar
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3 answers
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Does chromium chromate — Cr₂(CrO₄)₃ — exist?

Is it possible to synthesise chromium(III) chromate/dichromate? The intended formulas are $\ce{Cr2(CrO4)3}$ and $\ce{Cr2(Cr2O7)3}$ and they feature both trivalent and hexavalent chromium. However, ...
user avatar
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1 answer
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Amphoteric character of V2O5

In my NCERT textbook, in the chapter 'The d- and f-block elements', the last paragraph under oxides and oxoanions of metals goes like this: $(...)$ $\ce{V2O5}$ is, however, amphoteric though mainly ...
Harikrishnan M's user avatar
3 votes
2 answers
390 views

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
2 votes
0 answers
34 views

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
0 votes
1 answer
109 views

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
3 votes
0 answers
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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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0 answers
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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 ...
ajk's user avatar
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2 votes
1 answer
196 views

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
1 vote
0 answers
173 views

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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56 views

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
0 votes
0 answers
102 views

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
2 votes
2 answers
242 views

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
2 votes
0 answers
25 views

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
1 vote
0 answers
43 views

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 ...
Harshul's user avatar
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3 votes
1 answer
62 views

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 $...
Matteo's user avatar
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1 vote
0 answers
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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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0 votes
1 answer
873 views

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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0 answers
29 views

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
0 votes
0 answers
41 views

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
-1 votes
1 answer
595 views

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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4 votes
1 answer
914 views

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
3 votes
2 answers
205 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 $-4$ ...
AVS's user avatar
  • 521
0 votes
1 answer
115 views

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 ...
Sid N's user avatar
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0 votes
1 answer
510 views

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
210 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
0 votes
0 answers
268 views

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
1 vote
1 answer
134 views

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
41 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 ...
James K's user avatar
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1 vote
0 answers
23 views

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
36 views

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
0 votes
0 answers
194 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
335 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
4k 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
6k 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
39 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
554 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
  • 372
3 votes
1 answer
240 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 ...
Dirk Bruere's user avatar
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0 votes
0 answers
69 views

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?
Shub's user avatar
  • 408
0 votes
1 answer
175 views

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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