definition

anything that occupies space and has mass

the amount of matter in any object which does not change

the force of gravity acting on matter does change

the smallest unit of matter that retains the properties and characteristics of the element

when two or more atoms share electrons the resulting combination

one or two letter of the element name

is a particle that has a positive or negative charge because it has unequal number of protons and electrons

is the science of the structure and interactions of matter

is an atom or group of atoms with an unpaired electron in the outermost shell

a positively charge ion

a negatively charged ion

the force that holds together the atoms of a molecule or a compound

all the chemical reaction occurring in the body

chemical compounds that speed up chemical reactions by lowering the activation energy needed for a reaction to occur

dissolve another substance

all the synthesis reactions that occur in your body

all the decomposition reactions that occurs in your body