Question

What does '1s2, 2s2 2p2' means?

Answer 1

HEY.......
HERE IS U R ANSWER
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IT IS ELECTRONIC CONFIGURATION OF ELEMENT.
ACCORDING TO THIS THE ELEMENT IS HAVING 6 ELECTRONS.
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HOPE IT WILL HELP YOU A LOT....
THANKU.....

Answer 2

Answer:

If the element were to become excited, the electron could occupy an infinite number of orbitals. However, in most texts the example will be the next available one. So for oxygen, it might look like this: 1s22s22p33s1 - where the valence electron now occupies the 3s orbital in an excited (i.e. not ground) state.