Question

b) In the following table the mass no. and the atomic no. of certain elements are given: -


ELEMENTS A B C D E F

MASS NO. 2 3 4 14 31 19

ATOMIC NO. 1 1 2 11 15 13


Now answer the following: -

i) How many neutrons are there in an atom of F?

ii) State the valency/ valency’s of E

iii) Name two atoms which are isotopes.

iv) Name the noble gas ​

Answer 1

Explanation:

1. in F there is 6 neutrons ( 19-13= 6) A-Z

2 in E there is 3 valence electrons

3. a and c are isotopes

4.V