56
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
In an ATOM they are EQUAL in number. e.g. Hydrogen ; 1 proton and 1 electron Carbon ; 6 protons and 6 electrons. When they become unequal in number, they are no longer atoms , but IONS . The number of protons gives an element its characteristics. metal/non-metal etc., The number of electrons indicates the combing characteristics, with other atoms/ions.
There are 6 protons in a neutral atom of Carbon 13
An atom with 35 protons is iodine, which is a neutral atom. In a neutral atom, the number of electrons equals the number of protons, so it also has 35 electrons. Therefore, an atom with 35 protons has 35 electrons.
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5
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.