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7-Sci-Atoms-PTable

TermDefinition
atom the smallest particle into which an element can be divided and still be the same element
atomic theory the theory that states all matter is made up of atoms, all atoms of a certain element are identical, every substance is made up of atoms combined in certain ways
electrons negatively charged particles located outside the nucleus of an atom
nucleus a small, dense center of an atom that contains protons and neutrons
protons positively charged particles found the nucleus of an atom
neutrons uncharged particles found in the nucleus of atoms
electron cloud the area around the nucleus where electrons move around
atomic mass unit (amu) the unit used to represent the mass of an atom, 1 amu = mass of 1 proton
atomic number the number of protons in the nucleus of an atom, used to identify the element
mass number the mass of an atom, calculated by adding the total number of protons and neutrons
periodic table chart showing all known elements in rows and columns, organized by increasing atomic number
chemical symbol the abbreviation for an element's chemical name
chemical name the name of an element
metals elements on the periodic table that share these properties: shiny, conduct heat and electricity, are malleable (can be shaped)
nonmetals elements on the periodic table that share these properties: dull, brittle (crumble easily), poor conductors of heat and electricity
metalloids elements on the periodic table that can have properties of both metals and nonmetals, each element has a unique mix of properties
group (on the periodic table) the vertical columns, elements in the same column share characteristics
period (on periodic table) the horizontal rows, elements increase in size and weight from left to right but do not share characteristics
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