Isotopes

1 Define isotopes as different atoms of the same element that have the same number of protons but different numbers of neutrons

3 State that isotopes of the same element have the same chemical properties because they have the same number of electrons and therefore the same electronic configuration

2 Interpret and use symbols for atoms, e.g. ¹²₆C, and ions, e.g. ³⁵₁₇Cl⁻

4 Calculate the relative atomic mass of an element from the relative masses and abundances of its isotopes