unit of matter; the smallest unit of a chemical element consisting of protons, neutrons and   
     electrons.

a measurement of how hot or cold something is

the qualities and characteristics of matter that describe and identify it

the center of an atom made of protons and neutrons

anything that has mass and takes up space

particles with no charge making up part of the nucleus of an atom

a device that measures temperature

two or more atoms chemically joined; the smallest unit of a compound

positively charged particles making up part of the nucleus of an atom

the number of particles in matter

measurement of how much space matter takes up