Questions tagged [atoms]

Smallest particle still characterizing a chemical element. It consists of a small nucleus charged positively, carrying almost all of the atom's mass, with electrons surrounding it. This tag should be applied to questions that specifically concern atoms or their properties. For the charged particles, please use [ions] instead. If your question is specifically about [protons], [neutrons], or [electrons], use those tags instead.

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136 views

How many atoms are there in single element? [closed]

Elements are chemical substances made up of the same types of atoms (atoms with the same proton number), whereas molecules are chemical compounds made up of atoms from two or more different elements. ...
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2answers
119 views

Why electrons do not distribute evenly among the atoms in a molecule? [closed]

I was wondering why the state where electrons are evenly (or the closest to being evenly) distributed among the atoms in a molecule is not the lowest energy state? For example, in a water molecule it ...
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How is this possible in mole concept? [closed]

L = $6.022*10^{23}$ If I have one atom of oxygen , it has exactly L value. Now 2 atoms of a oxygen have 2L value.(Note that I mean 2O and not $O_2$here) Well , if we take a molecule made up of 2atoms ...
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2answers
244 views

Why there is a difference between atoms and chemicals

I recently asked this about why we call things "isotopes" and "elements" (atoms) instead of just having it be a bunch of particles bundled together in different numbers. This makes me wonder about ...
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3k views

Are protons or electrons responsible for the chemistry of an atom? [closed]

Is the question in a correct form? I can't add anything as a comment.
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56 views

Periodic Table and Atomic Radius

Well Wikipedia says that the atomic radius is lowered for elements in a group closer to noble gases (same row). It also says that those elements want to keep their valence electrons more than metals, ...
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30 views

Atoms in Solar Cells

An electric field in solar cells is created through photons knocking electrons off of atoms. What happens to the positively charged atoms once the electrons have been knocked off? Furthermore, are the ...
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1answer
3k views

Numerical value of mole [closed]

Why is the numerical value of a mole of atoms equal to the atomic weight? For example, hydrogen has an atomic weight of 1.008, so 1 mole of hydrogen atoms has a molar mass of 1.008 g/mol. Why?
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94 views

What does orbital mean, exactly? [duplicate]

My teacher told me that orbital is the probability distribution data of the electron around nucleus which is amplitude data in a way. An example of how my teacher actually told what it means involves ...
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325 views

Is this diagram correct for difference between 2N and N2

There is 1 $\ce{N2}$ molecule formed with 2 atoms of nitrogen. 2N is 2 separate nitrogen atoms which have not formed any bond.Reasons could be that they didn’t get enough energy to form bond so they ...
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64 views

Atoms and their vibration [closed]

We all know that the atoms in any solid matter vibrate about their mean position but why do they do so?? What will happen if they stop vibrating??
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7k views

Orbital diagram in which the Aufbau principle is violated [closed]

The orbital diagram in which the Aufbau principle is violated is: The answer given for this question is 3, but according to me if asked for Hund's rule violation then it would be 1, as electrons ...
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1answer
9k views

Whats the difference between 2O and O2 [duplicate]

I just saw something in a chemistry lesson what got me confused. What is the difference between $\ce{2O}$ and $\ce{O2}$? Thanks for the help!
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185 views

Why most of the atoms with fully filled outer orbits are gaseous?

Most of the elements with fully filled outer orbits are gaseous in nature (He, Ne, Ar, Kr, Xe, Rn) with exception of Uuo (as per Wikipedia its solid). Why these fully filled outer orbit elements are ...
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704 views

How do atoms combine? [closed]

Do atoms combine with the nearest atoms possible because of lower delta E (less energy needed to form a stable nucleus)?
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1answer
115 views

Antimatter molecules properties [closed]

Do the antimatter molecules have the same chemical properties with matter molecules?Should we define electropositivity for antimatter molecules since the chemical bonding would be between positrons?
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2answers
861 views

Is the maximum oxidation state of an element equal to it's valency?

I know maximum oxidation state has a sign and valeny doesn't.... But, if we remove the sign then, would it be equal to the valency of an element? I earlier assumed that valency was equal to the ...
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153 views

if the shared electrons in covalent bond revolves around their nucleus, how they hold the two molecules together? [duplicate]

Covalent bonds are formed by sharing electrons. The pictures depicting this bond make it seem like that the shared electrons stay in a fixed/limited place. What happens in reality? If they rotate ...
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277 views

Oxidation state of Cu

If copper has 1 valence electron in the 4s subshell, how is it able to form Cu2+ with oxidation state of 2? I know the energy level difference between the 3d and 4s subshells has a part to play here, ...
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91 views

If an atom of any element gained energy, does it always mean that its electrons gain energy too?

My book says ; "The transitioning of electrons in atoms from one energy level to another is associated with changes in the energy of the atom." But it hasn't made it clear whether or not the gaining ...
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1answer
14k views

Why is molar mass the same as atomic mass? [duplicate]

I am completely confused about why molar mass is the same as atomic mass. Could someone help explain why, thoroughly, but in simplified terms?
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1answer
16k views

How do I find the diameter of an aluminum atom from its density and atomic mass? [closed]

I am supposed to find the diameter of an aluminum atom using data given by my teacher. Here is the data: \begin{array}{cc} \text{Density of Aluminum}& \pu{2.70 g/cm3}\\ \text{Atomic Mass of ...
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189 views

In metallic bonding, what causes a metal to lose its outer electrons and become an ion? [duplicate]

In metallic bonding, what causes a metal to lose its outer electrons and become an ion? I am trying to understand metallic bonding, atoms and ions.
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The ambiguity regarding aufbau principle

According to a Blog https://ericscerri.blogspot.com/2012/06/trouble-with-using-aufbau-to-find.html written by Dr.Eric Scerri, On moving from the $\ce{Sc^3+}$ ion to that of $\ce{Sc^2+}$ it is plain ...
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is there any boundary or membrane around atom to recognize its shape?

we know that every Isolated atoms are spherically symmetric.how we know its shape, is there is any membrane covers it as skin of our body?
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Why is sulphur not written as S8 here [duplicate]

I learnt that sulfur dioxide and hydrogen sulphide react to form sulfur and water. The reaction given was: $\ce{SO2 + 2 H2S -> 2 H2O + 3S}$ So why is the product sulfur written as $\ce{S}$ and not ...
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1answer
131 views

Alternative to a proton [closed]

I know I might sound terribly stupid but the idea just hit me. We define elements on the periodic table as "lumps" of matter with specific amount of specific particles (electrons neutrons and protons) ...
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3answers
379 views

How does the vacuum in atoms persist?

From very elementary chemistry I understand that atoms are mostly empty space, with a few tiny little objects whizzing around. There must then be a vacuum in between these particles. I always thought ...
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1answer
28 views

How value of energy of elecron becomes more negative and radius of orbit decreases with increase in the value of atomic number? [closed]

I know how energy of elecron and radius of orbit depends upon principal quantum number......But how it depends upon atomic number?
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1answer
101 views

"Isotopes" in a molecule?

I just learned that atoms of the same element can have different mass because of they are isotopes. If there are two isotopes in which each reacts to form the same thing. Would the mass differ in each ...
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3answers
961 views

Does the 4s orbital really have a higher energy level compared to 3d? [duplicate]

For writing the electronic configuration of the $\ce{Fe^2+}$ ion, you need to remove two electrons (as it is an ion) which are from the highest energy level. Apparently, this would be $\mathrm{4s}$ ...
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1answer
237 views

Atomic structure [closed]

We've got a homework and I know this question may seem so primitive, but I have already read whole textbook and I've been looking also on the Internet, but I still cannot find the right answer. I'd be ...
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1answer
34 views

Emission spectra [closed]

I am a highschool student and I am really confused about the following: We studied that electrons cannot be between main energy levels therefore in an emission spectrum of an element lets say hydrogen ...
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1answer
18k views

How to calculate the number of atoms of each element in Mg(NO3)2? [closed]

I'm working on chemistry and I'm not quite sure how to solve this question? I haven't worked with moles before and whenever I try to figure out how to do these types of question I only end up ...
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0answers
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Will the ability to pull the electrons toward the most electronegative atom decrease with number of bonds? [closed]

Could it be thought that with higher number of bonds an atom form, the more its electronegativity will decrease? Let us take oxygen as an example, which is a really electronegative atom and usually ...
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1answer
85 views

Hydrogen and Hydrogen ion

Is it correct that a hydrogen atom only has 1 electron and 1 proton since the atomic mass is 1? Also, is the hydrogen ion composed of a single proton and no electrons? In an ionization process we know ...
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2answers
10k views

If the reactivity of group 1 elements increases down the group, why is this not the case for halogens? [closed]

I was wondering, as you go down a group, the atoms get bigger... This means that the electrons in the outer shell are further away from the nucleus, and so the attraction decreases and it is easier ...
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1answer
246 views

Molecules aren't the same as atoms?

Question is simple but tricky, for example my chemistry teacher says that preservatives on food for example Nitrate N3 are not good in excess for your body (like everything else), but if Nitrogen is ...
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2answers
859 views

How to convert metre to ångström? [closed]

In my book it says Convert $1.213\cdot10^{-11}$ metre into Angstrom. The answer is $12.13\cdot10^{-2}$ Angstrom. How is it possible? I thought of multiplying the metre with $10^{-10}$, but I ...
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1answer
2k views

Uncertainty of Atomic Mass [closed]

How should the uncertainty of the atomic masses of elements be quoted? E.g., Mg has an atomic mass of 24.31, what is that value's uncertainty?
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1k views

How is Molecular mass is the molecular weight? [closed]

Wikipedia says molecular weight is the mass!! I can't get it the weight is the mass times 10 so we cannot neglect that, because 10 amu is not equal to 1 amu
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1answer
86 views

How is the molar weight of C-12 equal to 12 gram ? Why is "g" not considered while calculating molar weight? [closed]

So, I was just pretty confused about how we simply multiply the "mass" of total nucleons in Carbon by the Avogadro Constant, to get the molar "weight" as 12 grams, shouldn't it be ...
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1answer
529 views

Why are moles of compounds have only 6.022x10 23 atoms? [closed]

I am a bit stuck on a basic chemistry concept. I understand that the Avogadro number indicates the number of chemical entities it has (ion, molecule or atom) What I don't understand is that when you ...
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1answer
72 views

Isotopes and elements [closed]

this is a gold bar. If we look at its structure, will we see that there are atoms that have a different number of neutrons (aka isotopes) (as far as I'm concerned, an isotope is an atom with a ...
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1answer
169 views

Is this bond Ionic or Covalent, and why? AlBr [closed]

We know a compound could form between NaCl because they are +1 and -1 ions which make them both into a complete valence set. Could a compound form between Al and Br, for example, and what type of bond ...
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1answer
519 views

Does berylium gain or lose electrons?

Does beryllium want to gain or lose electrons? I know it has 4 protons, 2 valence electrons, and it will gain or lose 2 electrons, but what is it?
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131 views

Atoms vs molecule when talking about the avogadro's number? [duplicate]

By far, my understanding is that a molecule is made up of atoms bonded together. For example, a molecule of water ($\ce{H2O}$) has 2 hydrogen atoms and one oxygen atom. However, when it comes to ...
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104 views

Can anyone give me detailed logical solution to my questions? [closed]

What is 1 amu? From where it is derived? Why it is compared with carbon-12? Why it was once compared with hydrogen-1? and now its not? Can anyone please explain me logically? And what would have ...
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1answer
43 views

What would happen if we supercool and then superheat an atom very abruptly? [closed]

Now scientists have found ways to cool atoms to temperatures far lower than we ever could before and maintain them for longer, but what if we had one of those particles and then heated it as fast we ...
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1answer
1k views

Ionisation energy [closed]

Explain why the 1st ionization energy of boron is less than that of beryllium, whereas the 2nd ionization energy of boron is greater than that of beryllium.

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