Question

The Z and A values of an element are 25 and 55. The number of electrons, protons, and neutrons in its most stable ion respectively are

• A. 25, 25, 30
• B. 23, 25, 30
• C. 22, 25, 30
• D. 20, 25, 30

Answer 1

Answer: (B)

23, 25, 30

Here Atomic number(Z) and Atomic mass number(A) are given as 25 and 55,

Total number of electrons $=Z=25$

Total number of protons $=Z=25$

Total number of neutrons $=A-Z=55-25=30$

Total number of electrons in most stable ion $=Z-2=23$