* Protons and Neutrons determine the Atomic Mass: The number of protons and neutrons together determine the atomic mass of an atom.
* Electrons determine the Charge: The number of electrons determines the charge of an atom.
* Neutral Atoms: In a neutral atom, the number of protons (positive charge) is equal to the number of electrons (negative charge).
How to Find the Number of Electrons:
1. Identify the Element: The number of protons defines the element. You can find the number of protons (atomic number) on the periodic table.
2. Assume Neutrality: Unless specified otherwise, assume the atom is neutral.
3. Equal Protons and Electrons: In a neutral atom, the number of protons equals the number of electrons.
Example:
* Carbon (C): Carbon has an atomic number of 6, meaning it has 6 protons. In a neutral carbon atom, it also has 6 electrons.
Important Note: Ions are atoms that have gained or lost electrons, so their number of electrons will be different from the number of protons.
