Atom:  Smallest component of matter

1. Types

1.1. Elements

1.1.1. Substance formed of atom w/ same atomic number

1.2. Isotopes

1.2.1. Same atomic number, with different number of neutrons

2. Bonding

2.1. Covalent

2.1.1. Share valence shells

2.2. Ionic

2.2.1. Atoms trade electrons; Become ionized; Attract each other b/c opposite charged

2.3. Hydrogen

2.3.1. Polar Covalent Bonds with Hydrogen Atoms

2.3.1.1. Solutions

2.3.1.1.1. Water can dissolve these polar bonds easier b/c of opposite charges

2.3.1.2. Electronegativity (EN)

2.3.1.2.1. The bond is polar b/c one atom has tendency to attract E- more than other

3. Subatomic Particles

3.1. Proton (+)

3.2. Neutron (0)

3.3. Electron (-)

4. Properties

4.1. Atomic Mass

4.1.1. Total : Protons & Neutrons

4.2. Atomic Weight

4.2.1. Weight average of Atomic mass of isotopes of element

4.3. Atomic Number

4.3.1. Total : Protons