Answer
please see the work below.
Work Step by Step
$a:$
Atomic number:
$\qquad$The number of proton present in the nucleus of an atom is called atomic number.
$\qquad$it is represented by $Z$.
$\qquad$Example:$\qquad$ O = 8$\qquad$C = 6
$b:$
Isotope:
$\qquad$ Atoms of the same element having same atomic number but different mass numbers are called
$\qquad$ isotopes of each other.
$\qquad$Examples:
$\qquad$Hydrogen has three isotopes$\qquad$1: protium$\qquad$2: deutrium$\qquad$3: tritium
$c:$
Mass Number:
$\qquad$ the sum of the number of proton and neutron present in the nucleus of an atom is called Mass
number. it is represented by $A$.
$\qquad$Examples: $\qquad$F = 7$\qquad$ Mg = 12
$d:$
Nuclear Charge:
$\qquad$ The total charge of all the protons present in the nucleus of an atom is called Nuclear charge.
$\qquad$Examples:$\qquad$Nuclear Charge of O = 8$\qquad$Nuclear Charge of N = 7
