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(B) The electronic configuration of atom $A$ is $1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^{10}, 4s^2 4p^3$. The valence shell configuration is $4s^2 4p^3$,which

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Nitrogen

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(B) The electronic configuration of atom $A$ is $1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^{10}, 4s^2 4p^3$. The valence shell configuration is $4s^2 4p^3$,which indicates that it belongs to Group $15$ of the periodic table. Elements in the same group exhibit similar chemical properties. Nitrogen $(N)$ has the atomic number $7$ with the valence configuration $2s^2 2p^3$,placing it in Group $15$. Therefore,the chemistry of $A$ is similar to that of Nitrogen.

The electronic configuration of an atom $A$ is $1s^2, 2s^2 2p^6, 3s^2 3p^6 3d^{10}, 4s^2 4p^3$. The chemistry of $A$ is therefore likely to be similar to that of:

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