Question

Atomic numbers of two elements of same mass
number A and B are respectively 18 and 20. If A
has 22 neutrons in its nucleus find out the number
of neutrons in B.​

Answer 1

Answer:

20 neutron s

Explanation:

atomic mass = number of electrons/ protons + number of neutrons

atomic mass of A is

Am=18+22

=40

Atomic mass of B is same of A

so ,

40=20+n

n=20

Answer 2

Answer:

20

Explanation