(a) 2 2 multiples of ½ allowed for 1 mark 1 (b) (i) 2. 8. 1 and 2. 8. 7 gains 3 marks 1 mark for 2 electrons in each shell 1 mark for 8 electrons in each second shell 1 mark for 1 electron in sodium outer shell and 7 in chlorine outer shell 3 (ii) sodium atom electron; chlorine atom electron for 1 mark each inversion = 2 marks lose negative charge = 1 mark 4 (c) (i) KCl (accept 2KCl) for 1 mark 1 (ii) both have on electron in outer shell/same number of electrons/ lose same number of electrons in compound formation/ both lose one electron for 1 mark 1 (d) 0 amps;
(a) 2 2 multiples of ½ allowed for 1 mark 1 (b) (i) 2. 8. 1 and 2. 8. 7 gains 3 marks 1 mark for 2 electrons in each shell 1 mark for 8 electrons in each second shell 1 mark for 1 electron in sodium outer shell and 7 in chlorine outer shell 3 (ii) sodium atom electron; chlorine atom electron for 1 mark each inversion = 2 marks lose negative charge = 1 mark 4 (c) (i) KCl (accept 2KCl) for 1 mark 1 (ii) both have on electron in outer shell/same number of electrons/ lose same number of electrons in compound formation/ both lose one electron for 1 mark 1 (d) 0 amps;
atomic_structure_part_5_mark_schemes.docx