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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30
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1answer
14k 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 ...
7
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1answer
2k 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?
6
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0answers
364 views

What is the most accepted explanation of aurophilicity?

Gold has a special property called aurophilicity. Inorganic chemistry by Huheey has some explanation, but that was not enough to clear the conception.
4
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0answers
2k views

When was the symbol for potassium changed from Ka to K?

Wikipedia says that Ka was a symbol for potassium once. Current symbol is K. Name changed due to a standardization of, modernization of, or update to older formerly-used symbol. When was the ...
4
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0answers
265 views

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 ...
3
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0answers
99 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 ...
2
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0answers
318 views

Why does zinc turn dark?

So I casted a zinc ingot around a week ago and I also casted 2 zinc ingots yesterday. After observing the two side by side I noticed that the older zinc ingot was darker colored, then I went and ...
2
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0answers
736 views

Can a more electropositive metal replaced by a less electropositive one?

I read from this reference that rubidium is extracted by reduction of its chloride with calcium or sodium. How is it possible?. Their electronegativities are much higher than rubidium. I think ...
2
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0answers
2k views

What is the most stable oxide of Fr?

I read that the heavier alkali metals, like K, Rb, and Cs all prefer to form superoxides. Since Fr is the heaviest alkali metal, I assumed it would follow the same trend as the previous alkali metals, ...
2
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0answers
2k views

Electronegativity (Oxygen and Phosphorus)

What makes an element electronegative. I understand, for example, $\ce{P(OR)3}$ is less basic than $\ce{PR3}$ because the oxygen in $\ce{P(OR)3}$ is more electronegative than P, so it pulls electron ...
2
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0answers
131 views

How do I model atoms with Moebius strips?

This question came to me while I was trying to model the list of elements (Mendeleïev), especially their masses and number of electrons. It came to my mind that it might be easier to model each ...
2
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0answers
2k views

Why there is an exception in melting and boiling point in p block?

Why is the boiling point and melting point of 15th group and 16th group has an exception? We know that as molecular mass increases boiling point and melting point also increase. So, down the group 15 ...
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0answers
31 views

Exceptional electromagnetic properties of lanthanide series elements

Why do so many lanthanide series elements have exceptional electromagnetic properties? They can form strong magnets and are also used in superconducting applications. The number of elements in the ...
1
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0answers
434 views

Why do osmium and iridium have the most oxidation states of all the elements?

Both osmium and iridium have 12 oxidation states. Indeed, iridium has the highest oxidation state of all elements at +9. see https://en.wikipedia.org/wiki/List_of_oxidation_states_of_the_elements I'...
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49 views

Non-standard source of lead?

Is there a way to get lead cheaply from local sources? I can buy ingots off eBay and there is a non-ferrous metal supplier I know who sells it for $12 for 5 pounds, but the shipping is nuts. I ...
1
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0answers
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 ...
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0answers
28 views

Why is effective nuclear charge used to explain the periodicity of size of atoms and ions?

Why is effective nuclear charge used for explaining the periodicity of size of atoms and ions, even though radius depends upon many other factors? The size of $\ce{Na+}$ is smaller than that of $\ce{...
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14 views

Where do I find data on 'molecular membership' sequences?

Techniques such as isotopic labeling allow for radioactive tracing of an element through a sequence of molecules. Using analytical instruments (such as LC-MS) we can then find out where labelled atoms ...
0
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0answers
51 views

Electrolysis of a calcium salt in polar aprotic solvent

If i found a calcium salt that is soluble in acetone or ethyl acetate, which are polar aprotic solvents, and attempted electrolysis, what would happen? Since polar aprotic solvents are used in metal-...
0
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1answer
495 views

Trends of electron affinity

Trends for electron affinity going across the group increases negatively. Does this mean Noble gases' electron negativity is more negative than halogens? I'm confuse here. Noble gases should have a ...
0
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0answers
19 views

Evaporating water from a combination of dietary minerals: will it work safely or react?

I've combined multiple elements dissolved in water into a preferred ratio, but would like to evaporate some of the water to increase the concentration (let's say at 200 $^{\circ}\mathrm{C}$ in the ...
-1
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1answer
175 views

Why atomic mass is taken in comparison?

The definition of atomic mass says that it is the mass of one atom of the element with respect to 1|12 of the mass of carbon-12 atom. My question is that why there is need to compare the atomic mass ...
-2
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2answers
3k views

Do the compounds in a chemical equation need a net charge of zero when predicting reaction products?

For predicting reaction products in chemical equations, I am not sure of what the subscripts would look like in the product side. I know the types of reactions, but when you predict the products, do ...