What is a divalent halide?

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Solution

Halogens (F,Cl,Br, I) have general electronic configuration is $n s^{2} n p^{5}$ .Generally, they required one electron to complete its octet.
A divalent halide is a halogen anion with a valency is 2, but this is not possible because halogens are one electron less from completing their octet. So halogens are monovalent and they make halides (X) by accepting one electron.
But in some cases, halogen forms divalent. Example $X e F_{2}, C a C l_{2}$

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Question 43 (a)
A element X (atomic number 17) reacts with an element Y (atomic number 20) to form a divalent halide.

Where in the periodic table are elements X and Y placed?

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