chapter 11 vocab
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a small particle that is the building block of matter
atom
the number of protons in an atom of an element
atomic number
a substance of two or more different elements chemically bonded together
compound
a negatively charged particle that occupies the space in an atom outside the nucleus
electron
the region surrounding an atoms nucleus where one or more electrons are most likely to be find
electron cloud
a substance that consists of only one type of adom
element
a mixture in which substances are not evenly mixed
heterogeneous mixture
a mixture in which substances are evenly mixed but not bonded together
homogeneous mixture
an atom that is no longer neutral because it has gained or lost electrons
ion
atoms of the same element that have different numbers of neutrons
isotope
anything that has mass and takes up space
matter
matter that can vary in composition
mixture
two or more atoms that are held together by covalent bonds and act as a unit
molecule
a neutral partial in the nucleus of an atom
neutron
the region in the center of an atom where mass and positive charge is concentrated
nucleus
a positively charged particle in the nucleus of an atom
proton