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Question

The ratio between radii of He+ ion and H atom is?

A
12
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B
1
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C
32
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D
2
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Solution

The correct option is A 12
The electrons in 'He+' and 'H' is '1'. But protons in He+ is 2 where in 'H' is '1'. So there is nuclear attraction in He+ which attracts electron and reduces size. Therefore , size of He+ is less than that in 'H'. So He+atomicsizeHatomicsize < 1.
From the given options, it is 1/2 [ only option less than 1]




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