Question

On moving from left to right in a given period,the number of shells.?

Answer 1

Answer:

hydrogen,helium,lethium,beriliyum,boron,carbon,oxygen,................

Explanation:

it is your explanation :-

Answer 2

Explanation:

on moving from left to right in along a period, the number of electrons and protons also increases. On moving from left to right in a period, the chemical reactivity of elements first decreases and then increases. On moving from left to right in a period, the number of valence electrons increases from 1 to 8.

hope you get the answer....