Metallic Bonding
3 marks · EasyDraw a simple 2D diagram to represent the metallic lattice of lithium metal. Label the positive metal ions and the sea of delocalised electrons.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
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Must show: Regular array of positive ions (e.g. circles labelled Li+), Dots or symbols for delocalised electrons, Clear label for 'sea of delocalised electrons'
Also accept: Delocalised electrons shown between the ions, as circles or crosses.
Common mistakes: Showing discrete molecules.; Not labelling ions or electrons.
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Draws regular array of positive ions (e.g., clearly separated and labelled 'Li+').
B2 (a) · 1 mark · Shows delocalised electrons between the ions (e.g., as dots or crosses).
B3 (a) · 1 mark · Labels both the positive ions and the 'sea of delocalised electrons'.
Worked solution
Regular positive ions arranged in rows, with electrons spread throughout and labelled.