Group 1 Elements

​The alkali metals are all soft, shiny and metallic when cut.

They react vigorously with water.

They have low melting points.

They have low densities.

They are good conductors of electricity.

​​Properties of Alkali Metals

​Group 1 elements include the ALKALI METALS, Li, Na, K, Rb, Cs, Fr.

The elements in group 7 are called halogens. They are Fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At)

​​Group 7 Elements

They have low boiling and melting points.

The halogens react with metals to produce salts. For example, chlorine reacts with sodium:

sodium + chlorine → sodium chloride

The halogens become less reactive going down group 7.

Properties

Halogen displacement reactions

A more reactive halogen can displace a less reactive halogen from solutions of its salts.

For example, chlorine is more reactive than iodine. A solution of chlorine can displace iodine from potassium iodide solution:

chlorine + potassium iodide → potassium chloride + iodine

Group 0 contains non-metal elements placed in the vertical column on the far right of the periodic table. The elements in group 0 are called the noble gases.

Group 0 Elements

• boiling point increases going down the group.

• density increases going down the group.

• atoms of group 0 elements have complete outer shells, so they are unreactive.

Properties