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Istopes: Atoms of the same element but with different neutron numbers and different masses.

Sub Atomic Particles: Protons, neutrons and electrons

Relative Atomic Mass: The Average mass of an atom compared to 1/12th of the mass of carbon-12 atom.

Relative Isotopic Mass: The average mass of an isotope compared to 1/12th of the mass of carbon-12 atom.

Ion: a positively/negatively charged atom or a group of atoms.

1st Ionisation Energy: The energy required to remove the first electron from each atom in one mole of atoms in the gaseous state.

2nd Ionisation Energy: The energy required to remove the 2nd electron from each ion in one mole of H+ ion in the gaseous state

Orbitals: Are a region of space that can hold up to two electrons with

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