1S2 2S2 2P6 3S2 3P6 How many shells are present in this atom?
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Answer:
3
Explanation:
As the question suggests the electronic configuration is 1s2 2s2 2p6 3s2
So, total number of electrons are 12 and also we know that the atom is neutral unless it has some charge. Here, we will consider that the atom is neutral. So, total number of protons will also be 12.
The number of protons = Atomic number
There are 3 shells present in this atom as the highest value of principal quantum number is 3. The principal quantum number tells us about the no. Of shells.
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