anything that occupies space and has mass
a pure substance that cannot be broken down into other substances by chemical reactions
substance containing two or more elements chemically combined in a fixed ratio
the smallest particle of an element that retains the properties of the element
subatomic particle having a positive charge; found in nucleus
subatomic particle having a negative charge; not in nucleus but surrounds it
subatomic particle without a charge; found in nucleus
protons and neutrons together; make up the center of an atom
identifies a specific element; equals the number of protons in an atom of each element
an unstable atom in which the nucleus decays (breaks down) releasing particles and energy
atoms having the same numbers of protons but different numbers of neutrons
occurs when atoms transfer electrons to other atoms
atoms that have lost or gained electrons
occurs when atoms share electrons
atoms that are held together by covalent bonds
interaction of substances that lead to the formation of new substances
the starting materials for a reaction; found on left side of chemical equation
ending materials of a reaction; found on right side of chemical equation
substance made of two or more elements, one being carbon
substance made of two or more elements, none of which is carbon
electrons in the outermost energy level; they are involved in bond formation
a covalent bond in which one pair of electrons is shared
a covalent bond in which four valence electrons are shared between two atoms
indicates the number and types of atoms in a molecule
shows the number and types of atoms in a molecule and how they are arranged
indicates the formation of new substances from previous substances
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