Revise GCSE Physics


Question:What are isotopes of atoms?

Isotopes are different atoms of the same element.

Each isotope has the same number of protons but different numbers of neutrons.

Isotopes have identical chemical properties because the number of electrons is not affected by changes in the number of neutrons.

For example, Carbon has 16 known isotopes, but only 3 isotopes of Carbon exist in nature.

Carbon-12, Carbon-13 and Carbon-14 are three isotopes of the element carbon with mass numbers 12, 13 and 14 respectively.

The atomic number of carbon is 6 (every carbon atom has 6 protons); therefore the neutron numbers in these isotopes are 6, 7 and 8 respectively.

Hydrogen has three main isotopes.

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