Periodic Table

Alkali Metals: Li, Na, K

→ 1 outer electron, form +1 ions (Li⁺, Na⁺, K⁺)

Alkaline Earth Metals: Be, Mg, Ca

→ 2 outer electrons, form +2 ions (Be²⁺, Mg²⁺, Ca²⁺)

Nonmetals: C, N, O, F, P, S, Cl

→ Often form negative ions or covalent bonds

Semimetal (Metalloid): Si

→ Has properties of both metals and nonmetals

Metal: Al

→ A typical metal

Noble Gases: He, Ne, Ar

→ Full outer shell, very stable

Special Case: H

→ Does not fit well into any group