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Matter
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anything that has mass and takes up space
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terms list
Matter
anything that has mass and takes up space
Atom
A small particle that is the building block of matter
substance
matter with a composition that is always the same
element
a substance that consists of only one type of atom
molecule
two or more atoms that are held together by covalent bonds and act as a unit
compound
substance containing atoms of two or more different elements chemically bonded together
mixture
matter that can vary in composition
heterogeneous mixture
A mixture in which substances are not evenly mixed
homogeneous mixture
a mixture in which two or more substances are evenly mixed but not bonded together
nucleus
the region in the center of an atom where most of an atom's mass and positive charge is concentrated
proton
a positively charged particle in the nucleus of an atom
neutron
a neutral particle in the nucleus of an atom
electron
a negatively charged particle that occupies the space in an atom outside the nucleus
electron cloud
the region surrounding an atom's nucleus where one or more electrons are most likely to be found
atomic number
the number of protons in an atom of element
isotope
Atoms of the same element that have different numbers of neutrons
ion
an atom that is no longer neutral because it has gained or lost electrons
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