The atomic radius of hydrogen atom is:

25

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30

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53

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43

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Solution

The correct option is C $53$ pm
Atomic radius is the measure of the distance between the center of the nucleus to the boundary of the electrons surrounded by it. The Hydrogen atom has an atomic number 1 and a standard atomic weight of 1.008. Its atomic radius is measured to be 53 pm where $p m$ stands for picometer measurement.

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If the radius of the hydrogen atom is 53 pm, the radius of the He $^{+}$ ion is closest to

If the radius of the hydrogen atom is 53 pm, the radius of the He $^{+}$ ion is closest to

a_{0} = 53 p m

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