The idea that substances are composed

of tiny, individual particles

like grains of sand (70)

Matter cannot be created or destroyed; it can only change forms. (70)

The process by which

a substance is broken down

into its constituent elements (74)

Any substance

that cannot be decomposed into

less massive substances  (74)

An element that

tends to give up its electrons. (77)

[Found on the left side of the jagged line on the Periodic  Table of Elements, with the exception of hydrogen.]

An element that tends to take electrons from other elements.  (77)

[Found on the right side of the jagged line on the Periodic Table of Elements.  Hydrogen is also a non-metal, even though it is on the left side of the jagged line.]

Elements found

along the stairstep line

that distinguishes

metals from nonmetals

Metalloids:

Boiron

Silicon

Germanium

Arsenic

Antimony

Tellurium

Polonium

Substances that

can be decomposed into elements

by chemical means

The proportion ofelements

in any compound

is always the same. (78)

If two elements combine

to form different compounds,

the ratio of masses of the 2nd element that react with fixed masses of the 1st element will be a simple,

whole-number ratio. (82)

More than one atom bound together

to form a compound (85)

Compound formed by

atoms that share electrons (87)