Question

A and B are two elements which have same atomic weight and having atomic number 27 and 30 respectively. If atomic weight of A is 57 then number of neutrons in B is ​

Answer 1

Answer:     27

Explanation:

Atomic wt. of A= atomic wt. of B = 57

For B

no. of protons= atomic no. = 30

Atomic wt.= no.of protons + no.of neutrons

=>    57=30+ no. of neutrons

So, no. of neutrons=57-30

                                =27