The Periodic Table (Edexcel A Level Chemistry)

Give the meaning of the term ‘periodicity’.
Illustrate your answer by referring to the atomic radii of the Period 2 and Period 3 elements.
Specific values of atomic radii are not required.

The melting temperatures of the Period 2 elements are shown.

Explain the trend in melting temperatures across the elements of Period 2 in terms of their structure and bonding.