The electronic configuration of fluorine is

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Question

(C) The atomic number of fluorine $(F)$ is $9$. According to the Aufbau principle,the electrons are filled in the order of increasing energy: $1s, 2s,

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$1s^2, 2s^2, 2p_x^2, 2p_y^2, 2p_z^1$

Vedclass · Answer

(C) The atomic number of fluorine $(F)$ is $9$. According to the Aufbau principle,the electrons are filled in the order of increasing energy: $1s, 2s, 2p$. The electronic configuration is $1s^2, 2s^2, 2p^5$. In the $2p$ subshell,there are $3$ orbitals $(2p_x, 2p_y, 2p_z)$. According to Hund's rule,electrons fill these orbitals singly before pairing. Thus,$5$ electrons in the $2p$ subshell are distributed as $2p_x^2, 2p_y^2, 2p_z^1$. Therefore,the correct configuration is $1s^2, 2s^2, 2p_x^2, 2p_y^2, 2p_z^1$.

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