Archive for category Structure Of Matter

Ionisation Energy

The amount of energy needed to steel an electron away from an atom.

Ionisation energy increases from left to right on the periodic table as the atoms are heavier and the nuclei have more charge. Metals on the left of the periodic table tend to loose electrons as they have a low ionisation energy.

Box notation can be used to show electrons in subshells.
Valence electrons are much easier to remove than core electrons

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Ionic and Covalent Bonding

Intermolecular forces

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Valence Shell Electron Repulsion Theory (VSEPR)


  1. Electrons inhabit regions of space surrounding the electron called subshells
  2. The outermost electrons are known as valence electrons and are can be used in covalent bonding.

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