Assertion (A): The number of moles of He in 52 g of He is 13.
Reason (R): The number of moles of an atom is the ratio of its given mass to its molar mass.
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An atmosphere is a layer or a set of layers of gases surrounding a planet or other material body, that is held in place by the gravity of that body. An atmosphere is more likely to be retained if the gravity it is subject to is high and the temperature of the atmosphere is low.
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