On moving across a period, the atomic size decreases and nuclear charge increases and therefore the force of attraction exerted by the nucleus on the electron in the outermost shell increases.
The first ionization potentials (in eV) of As and Se atoms, respectively, are:

14.6, 13.6

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13.6, 14.6

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13.6, 13.6

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14.6, 14.6

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Solution

The correct option is A
14.6, 13.6

$I . E ._{1}$ $A s > S e$ because of half-filled $n p^{3}$ electronic configuration.

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On moving across a period, the atomic size decreases and nuclear charge increases and therefore the force of attraction exerted by the nucleus on the electron in the outermost shell increases. The first ionization potentials (in eV) of As and Se atoms, respectively, are:

The correct option is A 14.6, 13.6 I.E.1 As>Se because of half-filled np3 electronic configuration.

On moving across a period, the atomic size decreases and nuclear charge increases and therefore the force of attraction exerted by the nucleus on the electron in the outermost shell increases.
The first ionization potentials (in eV) of As and Se atoms, respectively, are:

The correct option is A
14.6, 13.6

$I . E ._{1}$ $A s > S e$ because of half-filled $n p^{3}$ electronic configuration.