1.4 PERIODICITY TEST MS
1.	(a)	Elements in the p block have their outer electron(s) in
p orbital(s) or levels or sub-shells (1)
example of element (1)
correct electronic configuration (1)	3
				               [3]

2.	(a)	Na to Al are metals (1)
delocalised electrons (1)
Si and P are non metals (with covalent bonds)(1)	3

(b)	(i)	stronger metallic bonds in Mg (1)
smaller atoms/ions (1) (or more delocalised e’s)	2
(ii)	macromolecular (1)
covalent (1)	2

(iii)	sulphur is molecular (1)
weak forces between molecules (1)	2
(iv)	argon exists as free atoms (1)
smaller than Cl2 molecules (1)
weaker van der Waals’ forces (1)	3
[12]

3.		(a) power of an atom to attract electrons (1)
    in a covalent bond (1)	2
	(b) forms no compounds (1)	1
	
 [3]
4.	(a)	outer electrons are in third shell  (1) (allow 3s, 3p etc NOT 3d)
electronegativity is the power to attract electrons in a covalent bond (or shared pair)  (1)
electronegativity increases from Na to S  (1)
because number of protons in the nucleus (or nuclear charge) increases (1)
and the electrons are in the same shell (or experience the same shielding)  (1)
atomic radius decreases from Na to S  (1)
because number of protons in the nucleus (or nuclear charge) increases  (1)
and the electrons are in the same shell (or experience the same shielding)  (1)
(for 'the same reasons as electronegativity increases' scores one only)	max 7

								[7]