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i] Atomic radius of hydrogen is 37 pm. Express it in metres. ii] How does atomic size vary in a group and in a period.

Answer»

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Solution :`1 p m = 10^(-12) m`
ATOMIC radius = `37 XX 10^(-12) m`.
ii] In a group atomic size : increase down a group In a period atomic size: decrease in moving from left to right.


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