Why do atoms want to complete their shells?

In summary, the conversation discusses the concept of atoms creating bonds with other atoms in order to complete their outer shells and achieve a lower energy configuration. The physical mechanism behind this phenomenon is not fully understood, but it is believed to be related to the number of electrons in the outer shell and their spin. The conversation also mentions the role of covalent bonds and suggests further research on the topic.
  • #1
PainterGuy
940
69
Hi,

I have a basic knowledge of chemistry from high school days.

I remember once being told that a neutral hydrogen has one electron in its shell but it wants to complete its outer shell by having two electrons, and this makes hydrogen atom to create bonds with other atoms.

Likewise, a neutral atom such as that of chlorine has seven electrons in its outer shell but it likes to have eight electrons and therefore a chlorine atom loves to make bonds with other atoms.

The atoms of inert gases have complete outer shells therefore they have least interest making any bonds.

Those atoms don't have a desire of their own and behind that "it wants" and "it likes" there should be some physical phenomenon or mechanism which pushes the atoms in that direction of making bonds. Otherwise, I think, a neutral atom should be more happy.

Question:
What is that physical mechanism? Does that mechanism have something to do with having such number of electrons in the outer shell where the spin of one electron counters the opposite spin of another electron?

If it's really about the spin, then what is so bad about the spin of a single electron that it should be cancelled by an opposing spin of another electron even though the atom will no longer be neutral? For example, when a hydrogen has two electrons in its shell, the atom is no longer neutral.

Could you please guide me?
 
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  • #2
I think covalent bond is the key word for you to understand the issue.
 
  • #3
To keep things simple, think in terms of the lowest energy configuration.
 
  • #4
PainterGuy said:
Could you please guide me?
There must be so much about this online. At all levels of detail.
 
  • #5
PeroK said:
There must be so much about this online. At all levels of detail.

Yes, they mostly answer in terms of complete shells. Anyway, I will keep looking.
 
  • #6
As it was already said: think in terms of the lowest energy configuration.
 
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Likes PainterGuy and Hyperfine

1. Why do atoms have shells?

Atoms have shells because they are made up of positively charged protons in the nucleus and negatively charged electrons orbiting around the nucleus. The shells help to keep the electrons in their designated energy levels and maintain the overall stability of the atom.

2. What is the purpose of completing an atom's shell?

Completing an atom's shell allows it to achieve a stable and balanced state. This is because when an atom's outermost shell is filled with the maximum number of electrons, it becomes less reactive and is less likely to form chemical bonds with other atoms.

3. How do atoms know when to complete their shells?

Atoms do not have a conscious decision-making process, so they do not "know" when to complete their shells. Instead, the number of electrons in an atom's outermost shell determines its reactivity. If the outermost shell is not full, the atom will seek to gain or lose electrons to achieve a full shell and become more stable.

4. What happens if an atom's shell is not complete?

If an atom's outermost shell is not complete, it will be more reactive and likely to form chemical bonds with other atoms in order to complete its shell. This can result in the formation of compounds and molecules.

5. Can an atom have more than one shell?

Yes, an atom can have multiple shells. The number of shells an atom has depends on the number of electrons it has. Each shell can only hold a certain number of electrons, with the first shell holding a maximum of 2 electrons, and subsequent shells holding up to 8 electrons.

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