Question

Isotopes have same _____numbers but has different_____numbers.

• A. atomic
• B. mass

Answer 1

Isotopes:

• They have the same number of protons but a different number of neutrons, i.e, they have the same atomic number but a different mass number.
• They have the same chemical properties but different physical properties.
• They occupy the same position in the periodic table.

For example: ${}_6{}^{12}\mathrm{C}\mathrm{and}{}_6{}^{13}\mathrm{C}$ are the isotopes of carbon with the same atomic number, i.e. 6 but different mass numbers.

Therefore, Isotopes have the same atomic numbers but have different mass numbers.