Question

Hydrogen has three isotopes: protium (¹H), deuterium (²H or D) and tritium (³H or T). They have nearly the same chemical properties but different physical properties. They differ in ______.

Options

• number of protons

• atomic number

• electronic configuration

• atomic mass

Answer 1

Hydrogen has three isotopes: protium (¹H), deuterium (²H or D) and tritium (³H or T). They have nearly the same chemical properties but different physical properties. They differ in atomic mass.

Explanation:

Isotopes have the same atomic number but differ in mass. They each have a different number of neutrons, resulting in a different mass number.