Question

Among the following elements, the one having the highest ionisation energy is.
(a) [Ar]3d¹⁰, 4s² 4p³
(b) [Ne]3s² 3p¹
(c) [Ne]3s² 3p³
(d) [Ne]3s² 3p²

Answer 1

$<b>$
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Among the following elements, the one having the highest ionisation energy is.
(a) [Ar]3d¹⁰, 4s² 4p³
(b) [Ne]3s² 3p¹
(c) [Ne]3s² 3p³
(d) [Ne]3s² 3p²

→ [B]


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Answer 2

Among the four elements (c) $[Ne]3s^23p^3$ has the highest ionization energy.

Explanation:

• Ionization energy(IE) is the minimum energy which is required to remove electron from outermost orbital from an gaseous atom. This energy is defined at zero temperature.
• In a period, IE increases because of increase in Zeff and down the group IE decreases because atomic size increases and electron can be removed easily.
• (c) $[Ne]3s^23p^3$ has the highest IE because the p subshell is half filled and the energy required to remove electron is high, (a) $[Ar]3d^{10}4s^24p^3$ is also have half filled p subshell but the electrons are in 4th orbital, away from nucleus and can remove easily.