OP#2

A mixture that looks the same throughout

• heterogeneous mixture

• homogeneous mixture

The different physical forms in which matter can exist.

• classification of Matter

• states of matter

• The elements in the first column of the periodic table (except hydrogen).

• Properties:

  • Very reactive (especially with water)

  • Soft metals

  • Have 1 valence electron

• Examples: Lithium (Li),

• alkaline earth metals

• alkali metals

• transition metals

• halogens

• The large block of metals in the center of the periodic table.

• Properties:

  • Good conductors of heat and electricity

  • Often shiny, malleable, and ductile

  • Can have multiple oxidation states (form ions in more than one way)

• Examples: Iron (Fe), Copper (Cu), Gold (Au)

• alkaline earth metals

• alkali metals

• transition metals

• halogens

(Group 17)

• The second-to-last column on the periodic table.

• Properties:

  • Very reactive nonmetals

  • Have 7 valence electrons

  • Often form salts with alkali metals

• Examples: Fluorine (F), Chlorine (Cl), Iodine (I)

• alkaline earth metals

• alkali metals

• transition metals

• halogens

• The elements in the second column of the periodic table

• Properties: reactive

  • Have 2 valence electrons (group 2)

    Often form compounds like salts and minerals

• alkaline earth metals

• alkali metals

• transition metals

• halogens

The number of protons in an atom; it determines the element's identity.

• atomic number

• atomic mass

• atomic name

A horizontal row on the periodic table; elements in the same period have the same number of electron shells.

• group /family

• period

• reactivity

• A vertical column on the periodic table; elements in the same group have similar chemical properties and the same number of valence electrons.

• group /family

• period

• reactivity

• How easily an element reacts with other substances; related to the number of valence electrons.

• group /family

• period

• reactivity