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Modern Periodic Law

a A element X...

Question

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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Solution

X belongs to Group 17 and Period 3. Y belongs to Group 2 and Period 4.

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