3.2.1.2 Physical properties of Period 3 elements
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What is the bonding of period 3 elements?
Sodium, magnesium and aluminium are metals with giant structures which lose their outer electrons to form ionic compounds Silicon forms covalent bonds with some metallic properties Phosphorous, sulfur and chlorine are non metals which accept electrons to become ionic compounds or form covalent bonds Argon is unreactive
What does phosphorous naturally exist as?
P4
What does sulfur naturally exist as?
S8
What does the graph look like for the boiling points of period three elements?
See card
What is the atomic radii?
Half the distance between the centres of a pair of atoms
How does the atomic radii change across period and groups?
Decreases across each period Jump when starting the next period Atoms get larger down any group
Why do the atomic radii decrease across period 3?
Adding protons from left to right This increased charge pulls the electrons closer to the nucleus There is no additional electrons to provide more shielding Therefore the size of the atom decreases as you go down the period