Electronic configuration of anion in sodium hydridewill beNa81(1) 1s2(2) 1s1BH(4) 1s 2s1(3) 1s

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Electronic configuration of some elements is given in colum I and their electron gain enethalpies are given in Column II mathc the electronic configuration with electron gain enthalpy
$\begin{matrix} C o l u m n I (E l e c t r o n i c c o n f i g u r a t i o n) & C o l u m n I I E l e c t r o n g a i n e n t h a l p y / K J m o l^{- 1} A . 1 s^{2} 2 s^{2} 2 p^{6} & - 53 B . 1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{1} & - 328 C . 1 s^{2}, 2 s^{2}, 2 p^{5} & - 141 D . 1 s^{2}, 2 s^{2}, 2 p^{4} & + 48 \end{matrix}$

Q. The electronic configuration is

1 s^{1}

for __________.

1 s^{2}

is not the electronic configuration of:

Q. Number of unpaired electrons in the electronic configuration

1 s^{2}, 2 s^{2}, 2 p^{2}

is:

Q. Electronic configuration

1 s^{2}, 2 s^{2}, 2 p^{3}

represents the element:

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