Use the information in the table below to answer the questions that follow.
The letters do not represent the actual symbols of the elements.

Element	Atomic number	Melting point (°C)
R	11	97.8
S	12	650.0
T	15	44.0
U	17	-102
V	18	-189
W	19	64.0

(a) Give the reasons why the melting point of:
(i) S is higher than that of R (1 mark)
(ii) V is lower than that of U (1 mark)

(b) How does the reactivity of W with chlorine compare with that of R with chlorine? Explain(2 marks)
(c) Write an equation for the reaction between T and excess oxygen (1 mark)

(d) When 1.15g of R was reacted with water, 600cm3 of gas was produced. Determine the relative atomic mass of R. (Molar gas volume = 24000 cm3)(3 marks)

(e) Give one use of element V