If A,Z and N denote the mass number , the atomic number and the neutron number for a given nucleus, then which of the following statement is incorrect ?

Options

A. `N=Z+A`
B. isobars have the same A but different ` Z` and `N.
C. isotopes have the same `Z` but different `N` and `A`.
D. isotopes have the same `N` but different `A` and `Z`.

Answer

b,c,d

Explanation

Statement (a) is incorrect, In fact,
`A=Z+N`
Statements (b),(c ) and (d) are correct, they are the definitions of isobars, isotopes and isotones.