Question

answer this please
I need the answer of 13th question​

Answer 1

Answer:

2he is the right ans

go ahead with it

Answer 2

Answer: Be - 2

Cl - 3

He - 1

Al - 3

Explanation: The atomic number is the number of electrons, so distribute the electrons in the shells. The number of shells give the period.

Eg - Be

Atomic Number 4

Electrons distributed in shells as 2, 2

So it is present in period 2

Cl

Atomic Number 17

Electrons distributed in shells as 2, 8, 7

So it is present in period 3

Hope this helps!