ch 4

Front

Element Symbols

Back

Symbols used to represent chemical elements, usually consisting of one or two letters.

Front

Law of Constant Composition

Back

A given compound always contains the same proportion of elements by mass.

Front

Dalton's Atomic Theory

Back

A theory proposing that all matter is composed of atoms, indivisible and indestructible particles.

Front

Atom

Back

The smallest unit of an element, consisting of protons, neutrons, and electrons.

Front

Compound

Back

A substance formed when two or more chemical elements are chemically bonded together.

Front

Chemical Formula

Back

A representation of a substance using symbols for its constituent elements.

Front

Electron

Back

A subatomic particle with a negative charge, found in all atoms and acting as the primary carrier of electricity in solids.

Front

Nuclear Atom

Back

A model of the atom with a dense center of positive charge (the nucleus) around which tiny electrons move in a space that is otherwise empty.

Front

Nucleus

Back

The positively charged center of an atom, containing most of its mass.

Front

Proton

Back

A subatomic particle found in the nucleus of every atom, carrying a positive charge.