(a)[2]
Write a symbol equation for the reaction.
(b(i))[1]
Explain why sodium is able to conduct electricity when it is solid.
(b(ii))[2]
Complete the dot-and-cross diagram in Fig. 3.1 for a fluorine molecule. Show only the electrons in the outer shell.
(b(iii))[2]
Deduce the physical state of fluorine at -200 ^\circ\text{C}. Use the information in Table 3.1 to justify your answer.
(b(iv))[3]
Explain, in terms of structure and bonding, why sodium fluoride has a much higher melting point than fluorine.
(c(i))[2]
State what the term electrolysis means.
(c(ii))[2]
Write an ionic half-equation for hydrogen formed at the cathode.