A sample of matter that contains atoms that all have the same number of protons is an element.
These are called isotopes. They have the same number of protons and electrons, but different numbers of neutrons. Different isotopes of the same element have different masses.
A proton is a subatomic particle found in the nucleus of atom. The particle has a positive electrical charge, equal and opposite to the electron.
This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge (+1) and a mass of 1 atomic mass unit (amu), which is about 1.67×10−27 kilograms. And,
A chemical element is a species of atoms that have a given number of protons, including the substance consisting only of that species. Unlike chemical compounds.
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