Zusammenfassung der Ressource
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Democritus was a Greek scientist who was the first to notice the existence of atoms.
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Dalton was the first scientist to notice that different elements are made of different atoms, and are too small to be seen.
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The atomic number tells you the date that the element was discovered.
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The atomic mass number tells you how many protons + neutrons there are.
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An element symbol is sometimes different letters than the name because the people didn't know how to spell.
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You find the number of neutrons by subtracting the atomic number from the atomic mass number.
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The period number tells you the age of the founder of the element.
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The group number tells you how many electrons are in the outer most energy level.
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The three element families are Metals, Non-Metals, and Metalloids, and their group numbers are 4, 7, and 13.