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What's the melting and boiling points like for periods 2 and 3?
They generally increase from the 1st to the 4th elements in the period, then decrease from the 4th to the 8th elements
When do reasons for the trends become clear?
Once you start looking at the bond strengths and structures of the elements in periods 2 and 3.
What happens as you go across a period?
The type of bonding between the atoms of an element and the type of structure changes.
How do the elements and structure changes as you go across a period?
Changes from giant metallic to giant covalent and then to a simple molecular lattice