The periodic table and properties of elements

Periodic table - Topic 4

Mendeleev’s Periodic table

Mendeleev arranged his table by Atomic mass and by physical and chemical properties, aside from the older table based on strict atomic mass.

Alkali metals

Group 1 -> Alkali Metals

Contains: Lithium, sodium, potassium, rubidium, caesium and francium.

When observed you can see: floating, fizzes  

Flame tests

Lithium: red                       Sodium: orange           Potassium: lilac

Physical properties:

• Shiny (when cut)
• Low melting point
• Good Conductor
• Low Density
• More reactive as it goes down the table

They are stored under oil to stop them from reacting with oxygen to form an oxide layer (tarnish).

Lithium + oxygen -> Lithium oxide

4li  + O2          ->2Li2O

Transition metals

Transition metals are the block of the element is located between group 2 and group 3 of the periodic table.

Transition metals can…