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3rd Atoms Small

Horizontales
Energy Levels
Atoms of the same element that have different numbers of neutrons
Left on the Periodic Table
Round the atomic mass on the periodic table to the nearest whole number. e.g. 18.998 rounds to 19. Then subtract the number of protons.
Verticales
Right on the Periodic Table
A visual and simpler way to represent complex large or small concept
Tells us how many protons the atoms of that element contain.
Virtually mass-less particle with a negative charge that orbits the nucleus of an atom