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AQA AS CHEMISTRY
CHEM1 REVISION NOTES 3.1.4

Periodicity

Trends across Period 3
Atomic radius decreases across Period 3




This is because across the period, the atoms have more protons and the
electrons in the outer shell are pulled closer to the positive nucleus.

Melting and boiling point fluctuates across Period…

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give the metals a higher charge density, holding the ions together more
strongly.
Silicon is a giant covalent (macromolecular) tetrahedral structure with
strong covalent bonds between atoms that require lots of energy to break.
Phosphorus, sulphur and chlorine are all simple covalent (molecular)
structures. Because of the nature of their…

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