Atoms and PT Review

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element

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something that cannot be broken down by chemical or physical means

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atom

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smallest particle of an element

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electron cloud

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part of an atom where electrons are located. Electrons have a negative charge.

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nucleus

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part of an atom with protons and neutrons. Protons have a positive charge and neutrons do not have a charge (neutral)

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Rounding

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.4 or less, let it rest, .5 or more let it soar

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atomic number

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The atomic number is equal to the number of protons in an atom. These increase as you read from left to right on the Periodic Table of Elements.

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atomic mass number

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the number of protons and neutrons in one atom. This is the rounded atomic mass.

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isotope

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atoms with the same number of protons but differing number of neutrons. Atoms with more neutrons have a higher mass. This is why the atomic mass is a decimal (an average of all the isotopes).

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Demitri Mendeleev

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He invented the Periodic Table of the Elements.

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metals

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Elements that are shiny, malleable (bendable), and are good conductors of heat and electricity (the flow of electrons). Most elements are metals and are found to the left of the stair step line.