Question

The description of atomic particles of two elements X and Y is given below: [4]

x y

Protons 11 8

Neutrons 12 9

Electrons 10 8

i. What is the atomic number of X and Y?

ii. What is the mass number of X and Y?

iii. What is the formula of the compound of X and Y?​

Answer 1

a. no of proton + electron

11+10= 21,8+8 =16

b mas neutron + electron

23,17.

c sorry