Question

What group of elements generally have the lowest second ionization energy?

Answer 1

Hey there,
The ionization energy decreases from top to bottom in groups, and increases from left to right across a period.
Helium has the largest first ionization energy, while francium has one of the lowest.

Hope this helps :))

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Answer 2

By definition, the first ionization energy is the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions each with a charge of 1+.