That's not quite right! While carbon has an atomic number of 6, which is a whole number, other elements also have whole number atomic numbers.

Here's why:

* Atomic Number: The atomic number of an element is defined as the number of protons in its nucleus.

* Protons: Protons are fundamental particles with a positive charge. The number of protons determines what element an atom is.

* Whole Numbers: Since the number of protons is always a whole number (you can't have a fraction of a proton), the atomic numbers of all elements will always be whole numbers.

For example:

* Hydrogen (H) has 1 proton and an atomic number of 1.

* Oxygen (O) has 8 protons and an atomic number of 8.

* Gold (Au) has 79 protons and an atomic number of 79.

So, it's not just carbon, but all elements that have whole number atomic numbers.