Elements & Compounds

ATOM the smallest particle of an element Elements are the names of atoms

Element The name of a specific atom with specific properties A pure substance that cannot be broken down without extreme measures.

Elements: How they are written Elements are written using their Symbol. A CAPITOL letter alone: H Or a Capitol letter and a lower case letter: He

Molecule a particle made of two or more of the same atoms * A particle made up of two or more same compounds

Hydrogen + Chlorine = Hydrochloric Acid Compounds 2 or more different elements combine to make a new substance. H + Cl = HCl Hydrogen + Chlorine = Hydrochloric Acid

The new substance is different from both of the original elements. Na + Cl = NaCl Sodium + Chlorine = Salt (a metal) + (a liquid) = Salt

Formula: The Element Symbols put together to represent a new substance Symbol tells the Element Name. Subscript tells how many of that element.

Drawing Compounds We use circles & lines to draw.

Mixture Two or more of different elements or compounds that DO NOT combine chemically.

Diagrams of Mixtures