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Atoms – Keep it forever place. An atom has small particles that make up the atom. An element is made of atoms. A substance is made out of elements. For any element: Number of Protons = Atomic Number Number of Electrons = Number of Protons = Atomic Number
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An atom has small particles that make up the atom. • An element is made of atoms. • A substance is made out of elements.
For any element: • Number of Protons = Atomic Number • Number of Electrons = Number of Protons = Atomic Number • Number of Neutrons = Mass Number - Atomic Number Example Krypton: • Number of Protons = Atomic Number = 36 • Number of Electrons = Number of Protons = Atomic Number = 36 • Number of Neutrons = Mass Number - Atomic Number = 84 - 36 = 48
How many Protons, Neutrons, and Electrons? Mass Number = (Number of Protons) + (Number of Neutrons) Number of Protons = Number of Electrons