Question

Among III-A group elements the elements with highest and lowest I.P. values are:

Answer 1

Answer:

helium has highest first ionisation enthalpy and francium has the lowest

Explanation:

the ionisation energy decreases from top to bottom in the group and increases left to right across a period

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Answer 2

Answer:

Boron has highest Ionization potential and Indium has lowest Ionization potential.

Explanation:

Boron has highest ionization potential due to small atomic size and Indium has lowest Ionization potential due to large atomic size. Due to screening effect It has bigger atomic size than Thallium.

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