Question

A charged body consists of an unequal number of electrons and protons i.e 9 and 13 respectively. The body can be made neutral by _________.

• A. adding 4 electrons
• B. removing 4 electrons
  
• C. adding 3 electrons
  
• D. removing 3 electrons

Answer 1

The correct option is A adding 4 electrons

A neutral body contains an equal number of positive(protons) and negative(electron) charges.
As number of proton is greater than electron, so we need extra electrons to neutralize it.
Let the number of electrons required = x.
For neutral body,
Electrons - Protons = 0
(9 + x) - 13 = 0
x = 0
Therefore, the number of electrons required to neutralize the body is 4.