Ionisation energy is the energy required to remove one ____ of electrons from one mole of ____ atoms. It is measured in KjMol-1. First ionisation energy is the energy required to create ____ from atoms. The lower the ionisation energy the ____ it is to create ions from atoms. Factors affecting ionisation energies:-____ radii- The larger the atomic radius, the ____ away the outer electrons are held from the nucleus, and the ____ the nuclear attraction. -Nuclear charge- The greater the nuclear charge, the greater the ____ force on the outer ____. -____- electrons repel each other due to their negative charge. The greater the number of ____ shells of electrons, the ____ the repulsion of the ____ shell of electrons. Generally, first ionisation energy ____ across a period as nuclear charge and therefore force of attraction on outer electrons, increases. There are substantial drops in first ionisation energy between periods since the presence of more ____ increases atomic radius and shielding meaning outer electrons are easier to lose. Patterns across a period provide ____ for the existence of subshells.

First Ionisation Energy

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