Arrange the following elements in order of increasing ionization energy. Give an explanation. a) K, Cs, Na b) F, N, Be

a) Cs, Na, K The ionisation energy increases when going from bottom to top within a group due to electron shielding. b) Be, N, F The ionisation energy increases when going from left to right within a period. This effect can be explained by the octet rule.

KP
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