Lesson #3: Periodic table Objective: - 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 Metals Li, Na, K, Rb, Cs, Fr As you go DOWN group 1, the alkali metals become: 1.Bigger atoms 2.More reactive 3.Higher density 4.Softer to cut 5.Lower melting point 6.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 atoms 2.Less reactive 3.Darker in colour 4.They go from gas to solid 5.Higher melting point 6.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 increases 2.The boiling point increases Helium: in party balloons, hot air balloons Neon: in neon light bulbs Argon: in filament light bulbs Group 8/0: Noble Gases

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