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Published byAmbrose Juniper Cameron Modified over 9 years ago
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Parts of the Atom and The Periodic Table Open Chemical Building Blocks Book to Page 85. Get chalkboards, chalk, and eraser
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Nucleus Center of the atom. Makes majority of the atom’s mass. Made of Protons and Neutrons. Nucleus
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Protons Part of the nucleus Have positive (+) charge Protons are the atomic number on the PT Protons = number of electrons
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Neutrons Part of the nucleus Have neutral charge Varying neutrons make isotopes Find neutrons - Atomic Mass – Atomic Number (protons) = Neutrons
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Mass Number Part of the nucleus Number of protons + neutrons
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Isotopes Atoms with the same number of protons but different numbers on neutrons So you can change the number of neutrons and the element still maintains its identity Example: Carbon
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Electrons Orbit around the nucleus Have negative (-) charge Electrons = the number of protons
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Electrons – Energy Levels Energy levels are in the electron cloud and around the nucleus Each level has a set number of electrons that the level can hold up to Outer most level is for chemical bonding Energy levels are accurate until the 5 th energy level
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Atoms have neutral charge # of Protons (+) = # of Electrons (-) = 0 charge Example: Hydrogen How many electrons does C have?
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Electrons orbit in “shells” 1 st shell can fit 2 electrons 2 nd shell can fit 8 electrons 2 nd period/row 3 rd period/row 1 st period/row 3 rd shells can fit up to 18 electrons
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Reading and Using the Periodic Table Mass
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Atomic Number Definition: the number of protons in the nucleus Protons = Atomic Number = Electrons Tells us the identity of the element. Every element is defined by the number of protons in its nucleus
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Atomic Mass Definition: the ~ mass of one atom of an element Tells us how much one atom weighs in atomic mass units. Mass
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