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Three different atoms of oxygen are repr...

Three different atoms of oxygen are represented as :
`._(8)^(16)O,._(8)^(17)Oand._(8)^(18)O`
(i) What do the subscripts (lower figures) and supercripts (upper figures) represented ?
(ii) What factor is responsible for the change in the supercripts 16, 17 and 18, though the element is the same ?
(iii) What is the usual name for such atoms of an element ?
(iv) Give the nuclear composition of `._(8)^(18)O`.

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