Should we consider the number of neutrons as a characteristic of an atom?

Number of neutrons N = ………..

Find out the number of neutrons present in Fluorine atom.

In ._(13)^(27)Al the number of neutrons are

The number of neutrons present in Fluorine atom ""_(9)^19F =

If ‘Z’ is number of protons in the nucleus, ‘N’ is the number of neutrons in the same nucleus than atomic mass number A=

The number of neutrons in ""_(92)U^(235) is

The atom without neutron is

The number of neutrons in ""_(90)^(214)Th is

The number of neutrons in the radioactive Hydrogen deuterium is: