How can you find the valency of chlorine sulphur and magnesium?
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the capacity to donate, accept or share electrons determines the valency.
for eg,
chlorine: (atomic no. is 17,it has 7 valence electrons and need 1 electron to complete its octect so its valency is 1)
sulphur: (atomic no. is 16,hence need 2 electrons so its valency is 2)
magnesium: (atomic no. is 12,so its valency is 2 as it has 2 valence electrons)
hope u understand....
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