Question

The description of atomic particles of two element X and Y is given below

X Y
protons. - 8. 9
nuetrons - 8. 9
Electrons - 8. 9

(i) what is the atomic number of Y?
(ii) what is mass number of X?
(iii) what is the relation between X and Y?
(iv) which element/elements do they represent ?
(v) what is "Chemists's Dozen" ​

Answer 1

I don't know the answer