Answer:
Step-by-step explanation:
Argon is an element with the chemical symbol Ar and atomic number 18, which means that it has 18 protons in its nucleus. In its neutral state, the number of electrons is also 18, since the number of electrons in an atom is equal to the number of protons.
Therefore, there are 18 atoms in one mole of argon. However, if you are asking about the number of atoms in a single sample of argon, the answer would be one, since an atom is the smallest unit of an element that retains its chemical properties.