The atomic number is the number of protons.
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They are the number of protons in the nucleus of the atom. Since it is a count of protons, it must be a whole number.
Whole numbers are a proper subset of decimal numbers. All whole numbers are decimal numbers but not all decimal numbers are whole numbers.
Yes all whole numbers are integers
All whole numbers are rational numbers because they can be expressed as a fraction of integers.
The whole numbers are all numbers zero and up (including zero ).
You don't. All prime numbers are also whole numbers.