Skip to main content

Questions tagged [elements]

A pure chemical substance consisting of a unique type of atom with a distinguished by its atomic mass.

Filter by
Sorted by
Tagged with
0 votes
2 answers
116 views

What does "predicted" mean in an electronic configuration?

I've noticed the term "(predicted)" appearing at the end of electron configurations for heavier elements. Could you explain what it signifies and the reason behind it? I haven't been able to ...
6 votes
1 answer
120 views

Who defines the nomenclature of chemical elements in German?

I'm seeking the document which mentions the names of chemical elements in German. Some of them were changed in the past (e.g. Jod to Iod for iodine). IUPAC defines the standard name of elements for ...
3 votes
2 answers
99 views

Can superheavy elements form stable compounds? [duplicate]

Superheavy elements are the chemical elements with atomic number greater than 103. These elements are very unstable and decay extremely quickly. Nevertheless, I was wondering if these elements could ...
4 votes
2 answers
518 views

Extracting sulphur from hot springs with medieval technology?

For the sake of a dungeons and dragons game. Could sulphur be deposited on/extracted from hot springs water through evaporation or other proess?
-4 votes
2 answers
161 views

Why can't elements and atoms be separated by physical and chemical means?

Our textbook tells us ''that elements and atoms cannot be separated by chemical and physical methods. He says only atoms can be separated by nuclear methods.'' First of all, I would like to start my ...
6 votes
1 answer
366 views

Stability of beryllium isotopes

I have been reading about isotopes and their abundance on Wikipedia. It states that lithium has 2 stable isotopes, beryllium has 1 stable isotope (monoisotopic and mononuclidic) and boron has 2 stable ...
4 votes
2 answers
217 views

Elements with most commonly occurring isotope being different from the most stable one

Usually, stable isotopes have highest abundances, often much higher than radioactive ones. Are there any elements having most commonly occurring isotope different from the most stable isotope?
1 vote
1 answer
672 views

Trends of electron affinity

The trend in electron affinity is to increase negatively across a group. Does this mean noble gases' electronegativity is more negative than halogens? Noble gases should have a positive electron ...
1 vote
1 answer
92 views

How was it known certain materials were elemental (Hydrogen 1766, Phosphorous 1669, ...) before Dalton showed that matter was made of atoms in 1803?

Dalton showed in 1803 that matter was made of atoms rather than continuously distributed. But phosphorous, hydrogen, and other elements were identified before this discovery. How could they have known ...
15 votes
4 answers
3k views

Can osmium react with oxygen at room temperature?

I’m an avid collector of elements (I love shiny rocks - don’t judge). I’m looking to buy some osmium, as it’s one of the heaviest and hardest metals out there. However, people online told me to avoid ...
10 votes
4 answers
19k views

Are the elements lanthanum and actinium considered to be in the d block or the f block of the periodic table?

Many periodic tables place lanthanum and actinium in the f-block of elements, for example, this periodic table from Los Alamos National Laboratory. However, this table from the Royal Society of ...
2 votes
3 answers
16k views

Electronic configuration of uranium

I read that the electronic configuration of uranium is [Rn] 5f³ 6d¹ 7s² . Given that the subshells fill in the order 5f --> 6d, why is the 5f subshell only partially filled? Why do electrons fill ...
3 votes
1 answer
2k views

What is the most stable oxide of francium?

I read that the heavier alkali metals, like potassium, rubidium, and cesium all prefer to form superoxides. Since francium is the heaviest alkali metal so far, I assumed it would follow the same trend ...
0 votes
1 answer
165 views

Melting point of Scandium group elements

As I am learning about elements physical properties, i notice that the melting points of Sc, Y, La, Lu decreases down the group. I suppose the increase of atomic mass would result in better Van der ...
-2 votes
1 answer
78 views

Are any two elements indistinguishable by a single measure?

Elements can be investigated using a range of different techniques to determine their fundamental properties. Some properties of an element can be observed only in a collection of atoms or molecules ...
6 votes
0 answers
592 views

Predominance of III oxidation state for lanthanides

For most lanthanide metals, the stable oxidation state is III [*]. The general electronic structure is $$\ce{[Xe] 4f^{0}^{-14} 5s^2 5p^6 5d^{0}^{-1} 6s^2}\ \ [**].$$ Elements that have the d-electron ...
21 votes
4 answers
4k views

If you put two blocks of an element together, why don't they bond?

Say you have two lumps or blocks of an element, like lithium for example, say in the form of two bars. Why, when you bring the two bars together so that they touch each other, do they not instantly ...
21 votes
7 answers
34k views

What is the difference between an element and an atom?

First, I would like to quote sentences from a book introducing elements and atoms: An element is a fundamental (pure) form of matter that cannot be broken down to a simpler form. Elements are made up ...
4 votes
1 answer
230 views

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}]~\...
5 votes
2 answers
131 views

What words can I use to differentiate between cases where two atoms are of the same element versus when two atoms are of different elements?

I am writing my thesis, and usually I'm quite good with picking the right words for specific phenomena, yet I am having trouble finding the right words for this specific circumstance. I am trying to ...
2 votes
1 answer
286 views

Very Little Astatine

Astatine is the penultimate halogen in the periodic table with atomic number 85. It is very much radioactive and would vaporize itself by its own radioactivity before being collected. But there is ...
3 votes
3 answers
2k views

Diatomic Molecules/Elements

What is the difference between diatomic molecules and elements? Also, If oxygen is element of a single atom, then what makes it a diatomic element? But, then I read that a single oxygen atom can ...
-2 votes
1 answer
6k views

Molecular structure of all periodic table element molecules exceptional cases etc [closed]

I am searching about some basics in chemistry. I was looking for the molecular structure of all periodic table element molecules. eg: Hydrogen molecule: as $\ce{H2}$; structure: I was able to find out ...
8 votes
4 answers
3k views

Why are potassium organic salts ever preferable to the sodium equivalents?

$\ce{KOH}$, $\ce{KCN}$, $\ce{KNO3}$, $\ce{K2CO3}$, and plenty of other potassium salts are frequently used in industry. But, as far as I can see, the sodium equivalents are also widely used, often ...
-5 votes
1 answer
60 views

Are elements made out of many atoms? [closed]

So im reading a chemistry book right now, and always thought an element is made out of ONE atom, with special properties that make it this element. Amount of Protons, neutrons and electrons. But this ...
-7 votes
1 answer
2k views

Ordinary chemical means [closed]

What is the meaning of ordinary chemical means in the following: An element may be defined as a pure substance that can not be decomposed by ordinary chemical means.
6 votes
2 answers
552 views

Is it tennessINE because it has 117 electrons or because it behaves like a halogen?

The NPR News podcast and transcript The Convoluted Story Of How The First Atoms Of Tennessine Were Created includes the following exchange between science reporter Joe Palca and Oak Ridge nuclear ...
1 vote
3 answers
349 views

How can chlorine be 'only' the third-most electronegative element yet have the highest electron affinity?

From Wikipedia: It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity on the Pauling scale,...
1 vote
1 answer
689 views

Why are the rare Earth elements divided into light and heavy categories?

Rare Earth's up to z=62 (Samarium) are often called 'light' rare Earths, while z=63 (Europium) and beyond are sometimes referred to as 'heavy' ones. Why such distinction? I didn't have come across (or ...
3 votes
0 answers
33 views

What parameters do you use to find the order in which elements will leave a solution during electrolysis?

I am looking to perform electrolysis on a molten solution of many elements, specifically a mix of iron, sodium, potassium, silicon, aluminum, and titanium oxides and chlorides. What I'm trying to ...
14 votes
5 answers
5k views

Is there a way to contain fluorine gas for long term so that it can be visually observed?

Bromine, chlorine and iodine can all be sealed in a glass container for display without the elements reacting with the glass. But if you try to seal fluorine in glass I believe it will react and fog ...
0 votes
1 answer
76 views

Is there an international standard for rating the danger of chemical elements?

I'm writing a small little tool (something like an interactive periodic table) and I wanted a good "guesstimate" of the danger of certain elements, to visualize across said table. I could go ...
1 vote
0 answers
238 views

Why are some elements diatomic under normal conditions while others are not?

I see that the the standard form of many elements are diatomic molecules under normal conditions (eg oxygen, hydrogen and iodine are usually seen as diatomic molecules) and are all among the most ...
3 votes
1 answer
879 views

How many carbon, hydrogen, oxygen, nitrogen, and phosphorus atoms are there in the observable universe?

If I could somehow reliably count all the carbon, nitrogen, hydrogen, oxygen, and phosphorus atoms in the observable universe, what number would I come up with?
4 votes
2 answers
2k views

Chemical composition of seawater

Is it true that the sea water is composed of about $86\%$ oxygen, $11\%$ hydrogen and $3\%$ of minerals? The chemical formula of water is $\ce{H2O}$ (two hydrogen and one oxgen) that shows that the ...
0 votes
2 answers
116 views

Is the periodic table ordered by bonded atoms and does that change the electron configurations and ordering? [closed]

In my book (Mortimer, The Basic Knowledge of Chemistry) the electron structure of the elements is introduced, there the relative energies of the atomic orbitals are shown: 1s < 2s < 2p < 3s &...
2 votes
3 answers
4k views

Why does beryllium lose two electrons when it’s orbitals are already full?

I have a rudimentary understanding of orbitals, as in what they are, the shapes ($l$, I think) and of the principles. So I was doing the electronic configuration for beryllium. It has $4$ electrons, ...
1 vote
2 answers
99 views

Transform a star's carbon and oxygen into elemental hydrogen

Forgive me if this a really dumb Question, and yesterday Star Trek: Deep Space 9 suggested a terraforming specialist might transform a star's carbon and oxygen into elemental hydrogen, no details of ...
-4 votes
2 answers
154 views

Element Names in English [closed]

Na - Sodium - Natrium K - Potassium - Kalium W - Tungsten - Wolfram Sb - Antimony - Stibium and so forth. [English only] Why do we not use the names that match the symbols?
34 votes
1 answer
19k views

Melting and boiling point trend in Group II

The following picture shows the melting and boiling point trends down group II elements. I have added question marks where the variability in data was rather disturbing (over two hundred degrees ...
-2 votes
2 answers
4k views

Can an element be a single atom or a molecule made up of atoms of the same element?

Some online websites and some books as well suggest that elements are either atoms (e.g. Ne) or molecules (e.g. $\ce{H2}$, $\ce{O2}$). Original source: Tro, Chemistry: A Molecular Approach (2008) ...
4 votes
1 answer
2k views

Meaning of m2 in the symbol for an isotope of an element

What does the notation $^{197\mathrm{m}2}\ce{Pb}$ mean? Specifically, the '$\mathrm{m}$2' part. I've found this and it appears to have something to do with charge distribution. The original notation ...
4 votes
1 answer
222 views

How did we know about the existence of elements before quantum theory? [duplicate]

I'm reading a book about the elements, and it says all the time: discovered/isolated by X in a year. But how did the people know about the elements before the quantum theory? How did they know they ...
11 votes
2 answers
411 views

Do chemical bonds impact half-life of elements?

Let’s say we have element X with half life of 100 years. Can chemical bonds like X−X or X−Cl increase/decrease half-life of X? As a follow up question, can it increase/decrease radioactivity of X?
11 votes
2 answers
7k views

Elements which do not form oxides

I had thought that this question would be easy to answer but my searching has been unsuccessful in finding a clear answer. For the metals, I expect that they all form oxides. Some very readily, e....
1 vote
0 answers
25 views

Which ionic radius is most relevant for anticipating co-crystalization?

In the context of anticipating the likeliness that elemental impurities co-crystalize into the crystals containing an element of similar radius (see this question), which is the relevant radii to ...
3 votes
1 answer
213 views

Are the names for chemical elements the same in both modern Greek and classical Greek? [closed]

Have the modern Greek names for chemical elements known during antiquity (silver, copper, mercury, lead, gold, etc.) retained their Classical Greek names, or did they adopt Latin ones, or do they ...
9 votes
2 answers
4k views

Bonding of Lithium and Argon

I saw a meme that was joking around about Lithium and Argon bonding (see pic below). It got me wondering: Can Lithium and Argon bond in any circumstance?
2 votes
2 answers
2k views

Lithium metal not reacting with water

To start off with I want everyone to know that I'm not doing this for nay kind if drugs or anything illegal, just having some fun. So I know that lithium( Li) is the least alkaline metal in group one ...
7 votes
1 answer
16k views

Is it possible for Hydrogen to lose its electron?

I know the basics of Chemistry and one thing I've always wondered if it is possible for Hydrogen to give up it's one electron? I know Hydrogen is eager to share its election through covalent bonds, ...

1
2 3 4 5 6