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An element X (atomic number 17) reacts w...

An element X (atomic number 17) reacts with an element Y (atomic number 20) to form a Compound.
i]Write the position of these elements in the Modern Periodic Table
ii] Which one is a metal and which one is a non-metal?
iii] Write the formula of the compound.

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Electronic configurations are: `X (17) to 2, 8, 7 and Y (20) to 2, 8, 8, 2. 1`
i] X belongs to group 17 and period 3. Y belongs to group 2 and period 4.
ii] Y is a metal and X is a non-metal.
iii] YX, is the formula of the compound formed by them since valency of X is one and Y is two.
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