When a neutral atom<span> gains </span>electron<span>, creating an anion, the </span>atom's radius<span> increases.</span>
We know that, 1 mole of any substance contain 6.022 X 10^23 atoms/molecules.
Thus, 6.022 X 10^23 atoms = 1 mole
Therefore, 1.29x10^24 =

= 2.14
Thus,
2.14 moles<span>
are present in 1.29x10^24 hydrogen atoms in HF.</span>
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