Q) Using a dot and cross diagram to show the bonding in an ammonia, NH3, molecule.
(2009, Hl, 7 marks)
- Join N with three H atoms.
- N (group 5) > valency of 3 i.e. needs 3 electrons from other atom(s) for it to become stable.
- H (group 1) > valency of 1 i.e. needs one more electron to be stable.
- NOTE THE RELEVANCE OF VALANCY IN FUTURE
- N has 5 e- on outer shell
- 3 of these 5 are involved in bonding
- The NH3 has a pyramidal shape.
(b) Define oxidation in terms of electron tra...