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The ionization energy of an atom is the energy required to remove an electron from the atom in the gaseous state. Arrange the

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The ionisation energy varies as follows:

i) Ionisation energy decreases from top to botton in a group.

ii) Ionisation energy increases from left to right across a period.

Based on the above variation, we can get the order from decreasing to increasing as:

O(1313.9 KJ/mol) > Si(786.5 KJ/mol)  > Ni(737.1 KJ/mol) > Mn(717.3 KJ/mol) > Ba (503 KJ/mol)

The values are the first ionisation energy only.

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