Arrange the following elements in terms of increasing first ionization energy:
$G a, B a, R u, F, N$

B a < R u < G a < N < F

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G a < B a < R u < F < N

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R u < B a < G a < N < F

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None of the above

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Solution

The correct option is A $B a < R u < G a < N < F$
With the help of the periodic table, we can find the trend of the effective nuclear charge. It increases from left to right in a period and decreases down the group.
And more the effective nuclear charge, the higher will be ionisation energy.
Hence order will be as follows:
$B a < R u < G a < N < F$

Option A is correct.

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Atomic No.	Element	Electronic configuration	Select element of the same group
$11$	Sodium	...............	( $C a / N / K$ ) ..........
$15$	Phosphorus	...............	( $B a / N / R b$ ) ..........
$16$	Sulphur	...............	( $F / C l / O$ ) ..........
$9$	Fluorine	...............	( $C a / C l / K$ ) ..........

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?

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