Question

Atomic number and mass number of an element
M are 25 and 52 respectively. The number of
electrons, protons and neutrons in M2+ ion are
respectively
(1) 25, 25 and 27 (2) 25, 27 and 25
(3) 27, 25 and 27 (4) 23, 25 and 27​

Answer 1

Answer:

(4) 23, 25 and 27

Explanation:

• as the element is has loosed 2 electrons to form M+2 ion. the no. of electrons decreased to 23

• the no. of protons remains same

• the total no. of neutrons = mass number - no. of protons

therefore, no. of neutrons = 27

Answer 2

Answer:

4. 23, 25, 27

Explanation:

Since, Atomic no. is 25

therefore electrons and protons is 25

Atomic mass = No. of Protons + No. of electrons

52 = 25 + N

N = 27

Therefore Protons = 25

Electrons = 25

Neutrons = 27

So for M2+ ion their will be

Proton = 25

Electron = 23

Neutron = 27