Question

The atomic numbers of elements of a period are given below;
elements
Li
Be
B
С
N
atomic number
3
4
5
6
7​

Answer 1

Answer:

its correct and for mass no. of even no. just double it and for odd double +1 assumptions are in nitrogen and chlorine

Answer 2

I know this but i don’t know

Mark me as brainlist plz plz plz