Question

If the trivalent positive ion m3+ has mass number 56 contains 2 electrons in k shell, 8 electrons in l shell and 13 electrons in m shell the number of neutrons is

Answer 1

As in question total number of electron is given as 2+8+13=23.

As you know number of electron and proton is equal in a neutral atom so number of proton is also 23.

mass number = no. of proton + no. of neutron

56 = 23 + no. of neutron

no. of neutron= 56 -23

no. of neutron = 33