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2nd Atoms

Across
Levels
Tells us how many protons the atoms of that element contain.
Atoms of the same element that have different numbers of neutrons
Down
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.
A visual and simpler way to represent complex large or small concept
Virtually mass-less particle with a negative charge that orbits the nucleus of an atom