Interpretation:
The one − mole quantity of monatomic elements needs to be converted into mass and number of atoms.
Concept introduction:
Weight of an element is the product of molecular weight and number of moles. One mole of an element contains

Explanation of Solution
Nobel gases are monoatomic elements.
Let us take He and Ne
Formula used:
Weight
Number of atom
Given information:
Number of moles
Calculation:
He
Given moles
Gram molecules weight
Weight
Therefore weight
Number of atoms
Therefore number of atoms in
Ne
Given moles
Gram molecules weight
Weight
Therefore weight
Number of atoms
Therefore, number of atoms in
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Chemistry: Matter and Change
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