Question

what is the reason for keeping carbon ,oxygen and neon in the same period

Answer 1

HLO MATE...
THE REASON IS THAT..
The periodic table was made in the increasing order of the atomic numbers .so.,
carbon, oxygen, and neon are kept in the same period according to their valence, atomic number and etc..

Answer 2

Hello friend!!

Your answer is:

Carbon(C), Oxygen (O) and Neon(Me) are kept in the same period because they have the same number of shells in their respective atoms.

Here,
Carbon has the configuration 2, 4
Oxygen has the configuration 2, 6
Neon has the configuration 2, 8

We can infer from this that they all have the same number of shells.

Thus Carbon, Oxygen and Neon lie in the same period.

Hope it helps!!!

Cheers ☺☺☺