and
(i) What do the subscripts (lower figures) and superscripts
(upper figures) represent?
(ii) What factor is responsible for the change in the subscripts, 16, 17
and 18, though the element is the same?
Answer:
(i) The subscripts represents the atomic number of the
given atoms while superscripts represent their mass number.
(ii) Due to the presence of different number of neutrons in the given
atoms of oxygen, their mass number differs from each other because mass number
is the sum of number of protons and neutrons.
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