Question

(a) What is meant by (i) atomic number, and (ii) mass number, of an element? Explain with the help of an example.
(b) What is the relation between the atomic number and mass number of an element?
(c) If an element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?

Answer 1

Answer:

(a)

(i). the number of proton is equal to the atomic number and it also tells about the element which it is

(ii) the no. of proton+neutron= atomic mass or Mass no.

eg:. 12

C

6

atomic number=6

mass number=12

(b) mass number=atomic number+ number of

neutron atomic number=mass number+number of neutron

(c) 24

M

12

neutron=24-12=12