Atomic Structure

Atomic Structure

1. Atomic number

   • The number of protons in its nucleus

2. Mass number

   • The number of protons plus neutrons in its nucleus. Also known nucleon number

3. Isotope

   • Atoms of the same element which have the same number of protons but a different number of neutrons

4. Relative isotopic mass

   • The mass of one atom of an isotope relative to 1/12 of the mass of an atom of the isotope carbon-12 - values are relative so do not have units

5. Relative atomic mass

   • The average mass of an atom of an element relative to 1/12 of the mass of an atom of the isotope carbon-12 - values are relative so have no units

6. Mass spectrometry

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7. First ionisation energy

   • The energy required to remove one mole of electrons from one mole of gaseous atoms

8. Successive ionisation energies

   • The next ionisation energies after you have removed the first electron. The energy involved in the removal an electron successively from an atom is called the successive ionisation energy.

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