Periodic Classification and Periodic Properties - Result Question 22

####19. The first ionisation potential of $Na, Mg, Al$ and $Si$ are in the order

(a) $NaAl<Si$

(b) $Na>Mg>Al>Si$

(c) $Na<MgSi$

(d) $Na>Mg>Al<Si$

(1988, 1M)

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Answer:

Correct Answer: 19. (c)

Solution:

  1. Ionisation energy increases from left to right in a period. However, exception occur between group 2 and group 13 elements on account of stability of electronic configuration of valence shell.

$\Rightarrow$ The desired order is $NaAl<Si$



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