Question

which has lowest first conization energy and why
a) N or O​

Answer 1

Answer:

Here, you can see that the first ionization energy of oxygen atom is lower. ... Easier to remove → lower ionization energy. The second ionization energy of oxygen is higher than for nitrogen.

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Answer 2

Answer:

The first ionization energy varies in a predictable way across the periodic table. The ionization energy decreases from top to bottom in groups, and increases from left to right across a period. Thus, helium has the largest first ionization energy, while francium has one of the lowest.