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periodic table
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Term | Definition |
---|---|
valence shell | Outermost shell of an atom |
atomic mass | Number of protons plus the number of neutrons |
conductivity | Ability for heat or electricity to flow through it |
neutron | Part of an atom with a neutral charge |
electron | Part of an atom with a negative charge |
malleable | Able to be flattened out |
ductile | Able to be stretched without breaking; not brittle |
proton | Part of an atom with a positive charge |
luster | Ability to reflect light |
reactive | Causes a chemical reaction and releases energy |
families | Also called groups; columns on the periodic table (go up and down); Elements in a group have the same number of electrons in the outer level |
period | Rows on the periodic table (side to side); Each row represents the number of energy levels |
groups | up and down columns |
periods | side to side rows |
the most similar elements are in the same ______. | groups |
anything on the periodic table is _____. | an element |
compound | combination of two or more elements. |
mixture | physically combined; can be separated. |