I don't understand Chemistry

[Papewaio]

The number of protons determine the element. Protons are electrically positive.

If there are more or less electrons then protons it is an ion. Typically it is less when the atom is heated and it 'sweats off' an electron. Electrons are electrically negative.

Neutrons are electricall neutral. An element can have multiple isotopes for instance Carbon 12 and Carbon 14.
The element Carbon has 6 protons. Carbon-12 is 6 protons and 6 neutrons. Carbon-14 is 6 protons and 8 neutrons.