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NCERT CLASS IX - Science Textbook

Chapter 3 - Atoms and Molecules

How many atoms are present in a

(i) H2S molecule and
(ii) PO43-ion?


In an H2S molecule, three atoms are present; two of hydrogen and one of sulphur
In a PO4 3− ion, five atoms are present; one of phosphorus and four of oxygen....

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(i) in H2S three atoms are present, one of sulphur ,two of hydrogen.
(ii)in PO43- ion has 5 atoms , one of phosphorous ,four of oxygen.
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