Which of the following is an ionic compound?

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(D) In the nitrogen family (Group $15$),as we move down the group,the metallic character increases due to the increase in atomic size and decrease in

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$BiF_3$

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(D) In the nitrogen family (Group $15$),as we move down the group,the metallic character increases due to the increase in atomic size and decrease in ionization energy. Nitrogen and phosphorus are non-metals,arsenic and antimony are metalloids,and bismuth is a metal. Ionic character is observed when a metal reacts with a non-metal. $NI_3$,$NF_3$,and $NCl_3$ are covalent compounds because nitrogen is a non-metal. $BiF_3$ is an ionic compound because bismuth is a metal and fluorine is a highly electronegative non-metal.

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