Chapter 8: Periodicity

Question 1

Identify the s, p, d and f blocks in the periodic table

Answer 1

Question 2

Shape of s and p orbitals

Answer 2

Question 3

shape of d orbitals (beyond AS; useful though not essential for A Level)

Answer 3

Question 4

trends in melting and boiling points of Period 3 elements

Answer 4

Question 5

Explain the trends in melting and boiling points across period 3 (Na to Ar)

Answer 5

Increase from Na to Al because of increase of metalic bond strength (Na has one deleocalised electron per atom; Al has 3 delocalised electrons per atom).

Si is highest becuase it is giant covalent, so to melt, need to overcome strong covalent bonds.

From P to Cl, we go from S₈ to P₄ to Cl₂. The bigger the molecule, the more electrons and so the larger the instantaneous dipole.

Ar is monatomic.

Question 6

Trend in atomic radius from H to Ca

Answer 6