Question

Which atomic property is different in each isotope of an element?

Answer 1

Answer: 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: $_1^1\textrm{H}$ and $_1^2\textrm{H}$ are isotopes of hydrogen with mass number of 1 and 2 respectively.

Answer 2

In the question "Which atomic property is different in each isotope of an element?" The correct answer is the neutron and the mass number. Isotopes of an element are two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties. Therefore, isotopes of an element have different number of electrons and protons but different number of neutrons and different mass number.