Lesson #3: Periodic tableObjective:- The periodic table has groups and periods- Identify the groups and periods properties

Label and colour your periodic table.

Periodic Table

Groups: every column contains elements with specific properties

Periods: There is a gradual change or “trend” in properties across.

Elements are listed in order of atomic number- the number of protons in the nucleus of the atom.

Group 1: Alkali MetalsLi, Na, K, Rb, Cs, FrAs you go DOWN group 1, the alkali metals become:1. Bigger atoms2. More reactive3. Higher density4. Softer to cut5. Lower melting point6. Lower boiling point

5.4 The halogens

Halogen Horror

5.4 The halogens Properties of fluorine

•Yellow gas.•Smells like a swimming pool.•Very poisonous to all living things.

Properties of chlorine• Green gas.• Smells like a swimming pool.• Kills bugs. Also kills people if breathed in. Used in chemical warfare

and killed 5000 people in the First World War.• Bleaches colour out of materials.

Properties of bromine•Dark red liquid.•Smells like a swimming pool.•Kills bugs. Its vapour burns people’s eyes and lungs.

Properties of iodine• Shiny black solid, which sublimes to make a purple vapour.• Smells like a swimming pool.• Kills bugs. A useful antiseptic for humans. Its vapour irritates eyes

and lungs.

As you go down the table, this group becomes:1. Bigger atoms2. Less reactive3. Darker in colour4. They go from gas to solid5. Higher melting point6. Higher boiling point

Group 7: Halogens

5.3 Using noble gases

ALL of the noble gases have a full outer shell, so they are inert (don´t react)As you go down the group:1. The density increases2. The boiling point increases

Helium: in party balloons, hot air balloonsNeon: in neon light bulbsArgon: in filament light bulbs

Group 8/0: Noble Gases

• http://www.ptable.com/Other/Periodic%20Table.pdf