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Q.

Identify the elements $X$ and $Y$ using the ionization energy values given below
Ionization energy (kJ/mol)
$1 °$ $2 °$
X 495 4563
Y 731 1450

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An Intiative by Sri Chaitanya

a

$X = N a : Y = M g$

b

$X = M g : Y = F$

c

$X = M g; Y = N a$

d

$X = F : Y = M g$

answer is A.

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Detailed Solution

detailed_solution_thumbnail

$N a \to [N e] 3 s^{1} I E_{1}$ is very low but $I E_{2}$ is very high due to stable noble gas configuration of ${Na}^{'} .$

$M g \to [N e] 3 s^{2} I E_{1} and I E_{2} \to L o w$

$I E_{3}$ is very high.

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