Question:
State the number of atoms present in each of the following chemical species:
(a) $\mathrm{CO}_{3}{ }^{2-}$
(b) $\mathrm{PO}_{4}{ }^{3-}$
(c) $\mathrm{P}_{2} \mathrm{O}_{5}$
(d) CO.
Solution:
(a) Four
(b) Five
(c) Seven
(d) Two.
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