Find the oxidation numbers! (a) to (e)

a)S8中S的氧化數是零，因為凡任何不帶電荷的元素，其原子的氧化數為0，而S8中的Sulphur原子也不例外

b)the oxidation numbers of Mg = +2
2(?) + (+2)(3) = 0
2(?) = -6
? = -3
∴the oxidation numbers of the highlighted elements is -3.

c)the oxidation numbers of Na = +1
the oxidation numbers of O = -2
(+1)(2) + ? + (-2)(4) = 0
? + (-6) = 0
? = +6
∴the oxidation numbers of the highlighted elements is +6.

d)the oxidation numbers of Na = +1
the oxidation numbers of O = -2
(+1)(2) + ? + (-2)(3) = 0
? + (-4) = 0
? = +4
∴the oxidation numbers of the highlighted elements is +4.

e)the oxidation numbers of K = +1
the oxidation numbers of O = -2
(+1)(2) + ? + (-2)(4) = 0
? + (-6) = 0
? = +6
∴the oxidation numbers of the highlighted elements is +6.

a) 0

b) -3

c) +6

d) +4

e) +6