Module 1 Periodicity: Period 3 Atomic Radius

1
Module 1 Periodicity Period 3Atomic Radius
Nuclear charge increases Outer electrons
attracted more NO additional shielding
2
Module 1 Periodicity Period 3First Ionisation
Complicated! General increase as nuclear charge
increases
3
Module 1 Periodicity Period 3Electronegativity
Number of protons increases Attraction of
electrons increases
4
Module 1 Periodicity Period 3Melting Point
Na,Mg,Al Metallic Si Macromolecular P,S,Cl
Simple mol Ar Atomic
5
Module 1 Periodicity Period 3Boiling Point
Na,Mg,Al Metallic Si Macromolecular P,S,Cl
Simple mol Ar Atomic
6
Module 1 Periodicity Group IIAtomic Radius
Increase in number of shells Outer most electrons
further From nucleus
7
Module 1 Periodicity Group IIFirst Ionisation
Atomic radius increases Outer most electrons
become shielded
8
Module 1 Periodicity Group IIElectronegativity
Size of ion increases Size to charge ratio
decreases Covalent character of compounds
decreases
9
Module 1 Periodicity Group IIMelting Point
All metallic Charge to size ratio decreases Less
attraction to delocalised electrons Be,Mg
hexagonal close packed Ca,Sr face centred
cubic Ba body centred cubic
http//www.facstaff.bucknell.edu/kastner/univ281/C
rystalline20materials.htm