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Elements are classified as s, p or d block according to which orbitals the high energy electrons are in.

This can also be deciphered from an element's position in the periodic table:

Trends across period 3

Atomic Radius:

General Decrease

Increased nuclear charge, but electrons are being
added to…

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Melting and Boiling Points

Dependent on structure and bonding.

Na, Mg and Al ­ Giant metallic structures,
therefore strong attraction between metal ions
and delocalised electrons. Stronger Na due to stronger attraction between ions with a
higher charge and more delocalised electrons her

Si ­…


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