To ascertain the number of atoms in a mole of an element, you utilize Avogadro’s number, which is approximately $6.022 \times 10^{23}$ atoms per mole.

Avogadro’s number, named after the renowned Italian scientist Amedeo Avogadro, is a crucial constant in the field of chemistry. It represents the number of atoms, molecules, or other particles present in one mole of a substance. The mole itself is a standard unit of measurement in chemistry, defined as the quantity of any substance that contains as many elementary entities (such as atoms) as there are atoms in $12$ grams of pure carbon-12.

To calculate the number of atoms in a mole of an element, you simply multiply the number of moles by Avogadro’s number. For instance, if you have one mole of hydrogen, it contains approximately $6.022 \times 10^{23}$ atoms of hydrogen. If you possess two moles of hydrogen, the total number of atoms would be approximately $2 \times 6.022 \times 10^{23}$ atoms, and this pattern continues for any number of moles.

It is important to recognize that Avogadro’s number is extraordinarily large, reflecting the minuscule size of atoms and molecules. Even a small sample of a substance contains an immense quantity of atoms or molecules. For example, just one gram of hydrogen comprises roughly $6.022 \times 10^{23}$ atoms, a figure that far exceeds our everyday experiences.

In summary, to determine the number of atoms in a given mole of an element, one must understand the concepts of the mole and Avogadro’s number. Mastering these concepts enables you to effortlessly calculate the number of atoms in any specified amount of a substance. This foundational skill in chemistry is essential, as it allows you to comprehend and predict the interactions between different substances.