Question

Q1 The number of neutrons is dispositive zinc ion with mass number 70 is
a) 34 b) 36 c) 38 d) 40

Answer 1

given mass no = 70we know ,no of neutrons + no of protons = 70⇒number of protons doesnt change with charge of a particular element⇒number of protons = 30∴number of neutons = 40

Answer 2

the number of neutron is dispositive zinc ion with mass number 70 is 40