Do scientists know how many electrons an element has?

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Scientists know the number of electrons in each element, which is indicated on the periodic table. In their nonionized state, elements typically exist with a specific number of electrons, protons, and neutrons, primarily corresponding to their most common isotope. The concept of electron shells is crucial in understanding atomic structure and behavior. Electrons occupy these shells due to the Pauli exclusion principle, which states that no two electrons can occupy the same quantum state simultaneously. This arrangement is essential for explaining the reactivity and characteristics of atoms, as the behavior of electrons in their orbitals largely dictates chemical properties. The discussion also touches on the historical development of atomic theory and quantum mechanics, emphasizing the significance of shells in atomic and molecular bonding theories.
Mk
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Do scientists know how many electrons an element has? Can someone explain why I was taught about shells of electrons in atoms?
 
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An element in its nonionized state exist primarily as its most common isotope; that is with a specific number of electrons, protons, and neutrons.

You should review the introductory chapter on atomic orbitals; the history spanning the discovery of an electron up to the development of quantum mechanics should help you to understand the logic of shells and the importance in explaining and unifying molecular phenomenas.

The chapter on "shells" is rather complex and in depth. It pertains to atomic bonding theory, molecular bonding theory, and thus explains the stability/instability, color, structure etc...of molecules and atoms.

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I think this is my first post in the Chemistry Forum!

Originally posted by Mk
Do scientists know how many electrons an element has?

Yes, we know how many electrons each element has. It is stated on the periodic table.

Can someone explain why I was taught about shells of electrons in atoms?

Two electrons, by their nature, cannot be in the exact same quantum state. For that reason, they arrange themselves into shells in an atom. These shells are solutions to the Schrodinger equation (the basic equation of nonrelativistic QM).
 


Originally posted by Mk
Can someone explain why I was taught about shells of electrons in atoms?

The shells of electrons are very very important. Where the electrons are and in what orbit goes along way to determining the reactivity and characterisitics of the atom. Basically all of chemistry in all it's forms is mostly about what the electrons are doing in their orbitals.
 


Originally posted by Tom
Yes, we know how many electrons each element has. It is stated on the periodic table.



Two electrons, by their nature, cannot be in the exact same quantum state. For that reason, they arrange themselves into shells in an atom. These shells are solutions to the Schrodinger equation (the basic equation of nonrelativistic QM).


not quite true, while electrons are Fermions, (Pauli exclusion principle. )

At low temperatures, bosons CAN behave differently than fermions because an unlimited number of them can collect into the same energy state. known as condesation

pairs of electrons on the other hand can act like bosons... (added in the edit)

eg superfluid liquid helium.
 
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