Which atomic property is different in each isotope of an element? a. number of protons b. number of electrons c. charge d. mass number e. atomic number

D.   mass number

Explanation:

An atom is smallest unit of a matter or substance.It consist of three subatomic particles : electrons, protons, neutrons.

Mass number = Number of protons + Number of neutrons

Atomic number=Number of protons =number of electrons (for neutral atom)

Charge is developed on a electrically neutral atom by loss or gain of electrons.

Isotopes are elements which have same atomic number but different mass number. Example: and are isotopes of hydrogen with mass number of 1 and 2 respectively.