1. A nitrogenous base: This is a molecule containing nitrogen and can be one of four types: adenine (A), guanine (G), cytosine (C), or thymine (T) (in DNA) or uracil (U) (in RNA). Each base is made up of multiple atoms.

2. A five-carbon sugar: This is either deoxyribose (in DNA) or ribose (in RNA), and also contains multiple atoms.

3. A phosphate group: This consists of one phosphorus atom and four oxygen atoms.

Therefore, a nucleotide is made up of many atoms, not just a fixed number. The exact number of atoms depends on the specific nucleotide (which base, sugar, and phosphate group it contains).

However, we can say that a nucleotide is made up of at least tens of atoms.