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Rank these elements according to first ionization energy

Chemistry Jan 14, 2021

Rank these elements according to first ionization energy.

B, Be, O, N, F, Li, Ne, C

There is a general trend for ionization energy within a period of the periodic table. However, elements with a filled s or half-filled p subshell have a higher ionization energy than expected by the general trend.

Expert Solution

Ionization energy is the energy required to remove an electron form the outermost orbital of an element.

For elements with half filled and full filled orbital need more energy to be ionized

The ionization energy decreases with increase in size.

so the order is

(i) highest of neon due to full filled stability

(ii) Then flourine due to high electronegativity

(iii) then nitrogen followed by oxygen as nitrogen has half filled stability over oxygen

(iv) then Carbon then Be

(v) follwed by B and Li . Lithium can easily give electron as it attains the full filled orbtial stability on losing electrons

Ne > F > N > O > C > Be > B > Li

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