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An atom of chlorine has 17 protons.
protons
The atom must have 8 electrons to make it have a neutral charge
If a neutral atom of sodium has 11 protons, it will have 11 electrons also.
A neutral atom with 12 protons will have 12 electrons in order to balance the positive charge from the protons.
8 protons
There are 6 protons in a neutral atom of Carbon 13
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A neutral atom contains the same number of electrons as protons. Therefore, an atom with 18 protons will also have 18 electrons to maintain an overall neutral charge.
A neutral nitrogen atom has 7 protons. This is because nitrogen has an atomic number of 7 and each atom has the same number of protons as its atomic number. Therefore a neutral nitrogen atom would have 7 protons.
It will have 30 protons and 30 electrons if the atom is neutral.