1 - Atomic Structure - AQA A-level Chemistry

Relative Atomic Mass (Ar)

Relative Molecular Mass (Mr)

Relative Formula Mass

Relative Isotopic Mass

The mass of an atom of an isotope relative to 1/12 of the relative atomic mass (Ar) of an atom of Carbon-12

Isotope

Isotopes are atoms with the same atomic number (number of protons) and electron configuration but different number of neutrons —> different mass number

How does an isotope’s chemical and physical properties differ from an atom of the same element?

Isotopes have the same electron configuration so it still has the same chemical properties.

Different numbers of neutrons results in a different mass which can affect physical properties.

Ion

Describe the structure of an atom in terms of subatomic particles (mark?)

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