1a3 marks
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.
1b6 marks
The melting temperatures of the Period 2 elements are shown.
| Symbol of the element | Li | Be | B | C(diamond) | N | O | F | Ne |
| Melting temperature / K | 454 | 1551 | 2573 | 3970 | 63 | 55 | 53 | 25 |
Explain the trend in melting temperatures across the elements of Period 2 in terms of their structure and bonding.
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