Question

If a neutral atom there are 12 electrons and its mass number is 24, then the number of neitrons in it is

Answer 1

in neutral atom number of electrons is equal to number of protons and as mass of atom is equal to mass of (proton + neutron  )                         now , no of neutrons = mass no - no of protons =24  -  12= 12

Answer 2

The number of the neutron is 12.

• In an atom, the mass number of the atom is defined as the sum of the protons and the number of neutrons.
• Again for a neutral atom, the number of electrons is equal to the number of protons.
• So, the number of protons is 12 as the number of electrons is 12.
• The mass number of the atom is 24.
• So, the number of the neutron is 24-12=12.