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Questions tagged [elements]

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

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Crystal structures of heaviest nuclides' compounds

What is the heaviest element of the periodic table for which there is a compound whose crystal structure has been completely resolved by X-ray diffraction?
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Why is the conductivity of non-metals not equal to zero?

My chemistry book says that delocalized electrons are the reason for electrical conductivity in a metal. However it says that nonmetals like sulfur, phosphorus and silicon have "low" conductivity. How ...
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What is the group number or name for elements between group 3 and 4 (F-block) on the periodic table?

What is the group number or name for elements between group 3 and 4 (F-block) on the periodic table? I noticed when I look at a periodic table of elements, the elements of the F-block between group 3 ...
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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
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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 ...
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How do the odd proton-number elements originate?

I have a question about the origin of the odd proton-number elements in the periodic table, please. As it is generally thought that the big bang produces hydrogen first, and then hydrogen combined to ...
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Is there a standard scholarly reference for lattice constants of crystals of the elements?

I need to discuss the lattice constants of bulk crystals of several metal and semiconductor elements. I can find plenty of tables and numbers that are probably "close enough" but for a paper ...
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Why don't decomposition reactions form pure elements as products?

For example, if I had a reaction like this: $$ \ce{NaHCO3 -> Na2CO3 + H2O + CO2} $$ Why does it not break down all the way down to its elements? What makes it form such "intermediate" products, ...
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Is there open source software for SEM EDX data analysis?

This can't be unique to me and would apply to anybody who has to use equipment in other departments has had departments move etc. What open source packages exist to read and potentially manipulate ...
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What are the chemical similarities between gallium and barium?

I am analyzing nutrient concentrations in wood, and I have found that in all my samples the distribution of gallium and barium are closely related. As a related phenomenon, the presence of these ...
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Chemical elements or compounds with yellowish white color [closed]

Are there chemical elements or compounds that have a yellowish white (cream) color in their natural state?
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Does any element have nutritional (caloric) value?

Is there any single element (e.g. possibly carbon) that can be eaten, which has a nutritional value such that it provides calories? I found on Wikipedia (dietary element) that there are certain ...
Jonathan's user avatar
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What is the most rare element in periodic table

What is the most rare element in periodic table? I have a lot of confusion about this.
Fazla Rabbi Mashrur's user avatar
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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?
moonman239's user avatar
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How many elements have been identified for which there are no known spectral lines?

Background: @ProfRob's answer to If there were undiscovered elements (119 on) in a star's spectral lines, could we tell? in Physics SE begins: I think that would be very difficult indeed. ...
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Technecium and Technetium

Was technecium "recently" renamed technetium in English? I know when I formally studied chemistry (in the USA) that earth, air, water and fire were on the periodic table, but I really remember the ...
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At what temperature (in kelvin) are most of the elements on the periodic table liquids?

This question is out of pure curiosity. At what temperature are a majority of the elements on the periodic table in a liquid state/phase of matter? For the purpose of this question, assume the ...
Nathaniel Hill's user avatar
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Why elements with high atomic mass (like tungsten) are used in the production of X-rays, in the Cathode-Ray Tube?

I was studying about the production of X-rays, and was struck at how elements having high atomic mass (like tungsten) are used for the production of high energy X-rays. I am wondering why low atomic ...
user33632's user avatar
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The melting and boiling point decreases down the group up to group 14 (not including transition metals), but the trend reverses from group 15. Why?

In groups 1, 2, 13 and 14, the melting and boiling point decreases down the group with a few exceptions. In group 15 the melting/boiling point increases up to Arsenic and then started decreasing. In ...
Tatai's user avatar
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Ground state electron configuration of chromium [duplicate]

What is the ground state electron configuration of chromium? Is it $\ce{[Ar]}4s^23d^4$ or Is it $\ce{[Ar]}4s^13d^5$
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How to Find Each Element in Nature [closed]

I tried to google this but 'element' as a programming term complicated the search. I'm looking for a site or article that covers how one would find each element in nature, in its most abundant form. ...
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Are there natural or artificial enzymes that break down metals?

Do natural or human engineered enzymes exist that can speed up the break down metals (element, compounds & alloys)? If no, then what biological or chemical construct can break down metals in the ...
max's user avatar
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Is there a case when an atom of some element (e.g. carbon) does not have its expected number of protons (e.g. 6)?

Page 12 of the Study Guide for Campbell Biology, 11th Edition has the following question: A carbon atom has 6 neutrons. How many protons are present in the nucleus of a carbon atom? A. 12 ...
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Atomic weight = expected weight?

The atomic weight of an element, is it accurate to say that another way to think of it is the expected value of that element's weight if we were to sample one at random from the environment? Are man-...
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Why does oxidized copper become green?

Why does oxidized copper turn green? I am sorry if this question is too basic, but am really stumped here. It would be helpful if one could provide a research paper or website with your answer.
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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 ...
Nitrogen-8's user avatar
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What is the true depiction of the periodic table?

Normally with the periodic table the lanthanide series is separated out because it's long and would make the table wide. I looked for an expanded version and found this: I found it kind of strange ...
AJJ's user avatar
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What metal is under the stainless layer when it wears of?

I have this belt for several years now and the belt buckle is naturally subject to wear and tear. On the most exposed spots the outer layer is now completely worn of and I wonder Is this an example ...
VaNa's user avatar
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Difference between catenation and allotropy

Can anyone tell me what the difference between catenation and allotropy is? I would like the basic explanation.
Nilay Ghosh's user avatar
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What is the reason behind the characteristic colours of elements?

I've been trying to find out about this for some time now and when I searched online, I couldn't get any proper reasons. My question is: What is the reason for the characteristic colours of elements? ...
Siddharth Menon's user avatar
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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 ...
user148298's user avatar
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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 ...
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Does pyrite retain the magnetic properties of its element iron?

You are walking in the mountains and pick up what looks like a nugget of gold. You're aware that fools gold (iron pyrite, $\ce{FeS2}$) exists. Create an experiment to test if this is pure gold or iron ...
Shaun's user avatar
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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 ...
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Mass number of isotopes of copernicium denoted with 'm'

On this website: http://en.wikipedia.org/wiki/Isotopes_of_copernicium there is a sentence "This isomer is unconfirmed" as a footnote explaining two isotopes. What do they mean by 'isomer' in this ...
user1432671's user avatar
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1 answer
215 views

Can you calculate the properties of a substance based solely on its atomic properties?

I'm trying to write some software that I can use to determine, roughly, what the physical properties of a pure substance are. I know I could just use a database of the known properties of each element,...
mdeforge's user avatar
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Law of reciprocal proportion

Is it necessary that the valency of an element must have the same valency? For eg. If 2 elements A and B combine with the same mass of C, is it necessary that they will have the same valency as they ...
biogirl's user avatar
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Discovery of elements

How did the first chemists know that a sample contained so and so elements? If they tried to find through reactions,they should know what elements make up the other reactant(s), and how it reacts ...
P.K.Harshith's user avatar
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1 answer
239 views

Similarities between Co and Ni [closed]

Elements $\ce{Co}$ and $\ce{Ni}$ share many similar/same properties and usually if one of them is an example of some group (e.g., ferromagnetism, same possible oxidation states, packing fraction and ...
ba-13's user avatar
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How to find density of element metals

I was wondering, how do I determine what metal (element) has the highest density by using the periodic table? Is it possible?
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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 ...
Lark's user avatar
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0 answers
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Can CO2 be cracked by electrolysis? [closed]

What can be added to liquid $\ce{CO2}$ to lower the electricity needed to crack $CO_2$ ? Answer: Zirconium dioxide What form and temperature of $\ce{CO2}$ is best to crack with or without Zirconium ...
Muze's user avatar
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2 answers
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Can you combine elemental gold and boron?

Is it possible to combine gold and boron to form compounds? A simple example being: $$ \ce{Au + B -> AuB} $$
creekorful's user avatar
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1 answer
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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 ...
Proscionexium's user avatar
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3 answers
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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 ...
Jonathan Smith's user avatar
2 votes
2 answers
7k views

Why are transition metals said to have different valencies?

I understand that the term valency refers to the number of bonds an element would be able to form with either chlorine or hydrogen. If this is directly related to the number of valence electrons an ...
L. Mutal's user avatar
2 votes
1 answer
112 views

what does it mean to say oxygen in a given context?

My textbook "chemistry by Julia" says the following When it comes to expressing the molar mass of elements such as oxygen and hydrogen, we have to be careful to specify what form of the ...
user91444's user avatar
2 votes
3 answers
588 views

Do isotones share any similarities?

A trivial research in atoms and their basic theories led me to this term: "isotones" Nuclides sharing the same number of neutrons but different atomic numbers. A simple request or shall I say, quest: ...
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1 answer
3k views

Why is silicon used in computer chips?

Most computer chips contain or are made of silicon. Why silicon? Why not copper or tellurium or some such?
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1 answer
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What are the safest non-toxic elements I can own? [closed]

As in a recent question, I mentioned I collect elements. My collection already has quite a few elements and a rare alloy (I have silicon, molybdenum, tungsten, gold, platinum, silver, copper, ...
Mister SirCode's user avatar