Unit 1 Sec 2.1

Nature and Composition of Matter

A. MATTER

1. Matter: anything that occupies space and has mass

a) Example:

2. Mass: quantity of matter an object hasa) Example:

B. ELEMENTS

1. Element: pure substance that cannot be broken down chemically into simpler kinds of matter

1. Example:

C. ATOMS

1. Atom: simplest particle of an element that retains all of the properties of that element

2. Nucleus contains:

a) Protons:

b) Neutrons:

1. Electrons:

a) Energy Levels:

D. COMPOUNDS

1. Compound: pure substance made up of atoms of 2 or more elements

Example:

2. Molecule:Example:

E. BONDS

1. Covalent bonds: 2 atoms share one or more pairs of electrons

E. IONIC BONDS

4. Ion: charged particleExample:

5. Ionic Bond:Example: