Metallic Bonding
2 marks · HardDraw a simple 2D diagram to represent the arrangement of particles in a piece of barium metal. Clearly label the positive ions and the sea of delocalised electrons.
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Must show: rows/array of Ba$^{2+}$ ions, representation of sea of delocalised electrons, clear labels: 'Ba$^{2+}$ ion', 'sea of delocalised electrons'
Also accept: ba2+ written as Ba$^{2+}$ with alternative electron symbol
Common mistakes: Molecules rather than lattice structure; Not labelling parts; Missing electrons
Show mark scheme and worked solution
Marking points
D1 · 1 mark · Draws regular arrangement (lattice) of positive Ba$^{2+}$ ions and indicates surrounding electrons as a sea.
L1 · 1 mark · Labels Ba$^{2+}$ ions and the sea of delocalised electrons (both labels must appear).
Worked solution
The diagram shows Ba$^{2+}$ ions in a regular lattice, with a label for the sea of delocalised electrons around them.