PERIODICITY

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periodicity : atomic and physical properties

Resource summary

PERIODICITY
1 Atomic Radius
1.1 Across Period (Decreases)
1.1.1 Effective nuclear charge increases
1.2 Down the group (Increases)
1.2.1 Increase in quantum shell
1.3 Ionic Radius
1.3.1 Down the down (Increases)
1.3.1.1 Increase in quantum shell
1.3.1.1.1 Cation radius < its atomic radius
1.3.1.1.1.1 lose electrons; nuclear charge is constant thus stronger force of attraction
1.3.1.1.2 Anion radius > its atomic radius
1.3.1.1.2.1 gain in electrons; extent of repulsion is greater thus weaker force of attraction
1.3.2 Across Period (Decreases)
1.3.2.1 nuclear charge increases
1.3.2.2 note: from Si4+ to P3-, there's a sharp increase due to anions having one more quantum shell
1.3.3 Ionisation Energy
1.3.3.1 Write down the configuration
1.3.3.1.1 Distance from nucleus
1.3.3.1.2 Inter-electron repulsion
1.3.3.2 Across Period: Effective nuclear charge
1.3.3.3 Down the group: Distance from nucleus
1.3.3.4 Electronegativity
1.3.3.4.1 Across Period: (Increases)
1.3.3.4.1.1 Effective nuclear charge
1.3.3.4.2 Down the group: (Decreases)
1.3.3.4.2.1 Distance from nucleus
1.3.3.4.3 Melting Point
1.3.3.4.3.1 Increases around a period until a maximum is reached at group IV (giant molecular structure) and then decreases across the period
1.3.3.4.3.2 Electrical Conducitvity
1.3.3.4.3.2.1 Increases through the metals and decreases through the metalloids and non-metals
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