Question

4. How can you determine number of neutrons in
the nucleus of an atom from the knowledge of
mass number and atomic number?​

Answer 1

Answer:

Mass no is sum of no. of proton and neutron.

atomic no. is same as proton no in atom so,

N = mass no. - atomic no.

Answer 2

Answer:

n = A-Z

Explanation:

n means neutrons

A means atomic mass number

Z means atomic number

  For EX :  No. of neutrons in Sodium (Na)

        ans : mass no = 23

                  atomic no=11

                  no of neutrons =A-Z

                                             23-11

                                              = 12