Which of the following substances is ionic?

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(D) In the nitrogen family (Group $15$),the metallic character increases down the group. Nitrogen and phosphorus are non-metals,arsenic and antimony a

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$BiF_3$

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(D) In the nitrogen family (Group $15$),the metallic character increases down the group. Nitrogen and phosphorus are non-metals,arsenic and antimony are metalloids,and bismuth is a metal. $NI_3$,$NF_3$,and $NCl_3$ are covalent compounds because they are formed between non-metals. $BiF_3$ is an ionic compound because it is formed between a metal (bismuth) and a non-metal (fluorine),where the electronegativity difference is significant.

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