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An element X has a valency 1. (i) Write the chemical formula of its phosphide.

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An element X has a valency 1. 

(i) Write the chemical formula of its phosphide. 

(ii) Write the chemical formula of its chloride. 

(iii) Is element X a metal or a non-metal?

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Chemical formula: X3P

(ii) 

Chemical formula: XCl

(iii) The element X is metal.

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