Periodicity

3.1 The periodic table

Groups - Periods

Practice

3.2 Physical properties

Electrostatic forces

F=k q1 q

2/r2

Distance of electron from nucleus ( r ) has a larger effect than charge of nucleus (q

1)

and charge of electron (q2)

rr

q

Metals: ionic < atomic radius (shell lost)Non-metals: ionic > atomic radius (e-e repulsion)

Electronegativity - Ion.Energy

r

q

Melting point

Metallic bond V.d.Waals forces

Practice

3.3 Chemical properties

Alkali metals + water

2Li + 2H2O 2LiOH + H

2

- exothermic- alkaline solution- gas/bubbles

Alkali metals + water

Alkali metals + halogens

Halogens + halide ions

Remember Redox: Reactivity series and spontaneity

Reactivity series

Oxides of period 3 + water

Practice

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