Atoms are the smellest particles of matter

​Atoms have a nucleus in which protons and neutrons are located. Outside the nucleus atoms have electrons, organized in energy levels, and moving in different wave patterns around the nucleus

There are 118 different kinds of atoms

Atoms are organized in the table of elements by valence.

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​Valence is the number of electrons atoms have in the most outward energy level orbit

There are 118 different kinds of atoms

The atomic number is the number of protons an atom has in its nucleus

This is the symbol for sulfur. It's atomic number is 16

The atomic mass is the number of protons and neutrons an atom has in its nucleus

This is the symbol for sulfur. It's atomic mass is 32.065 atomic units. This is the mass of a sulful atom