JEE Main Chemistry question

If Aufbau rule is not followed, K-19 will be placed in

(A)-block
(B)-block
(C)-blockCorrect
(D)-block

Answer: (C)

Solution

Potassium's 19th electron normally enters the orbital (Aufbau rule, since is filled before ). If this rule were ignored and electrons simply filled the lowest available principal-shell-then-subshell order without the

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Question ID VK-133242