The formulae of some compounds are given below. Write down the names of the elements that each one contains.
Co₂, H₂S, HgO, MgCl₂, PbS

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Solution

CO₂: It contains one atom of carbon and two atoms of oxygen.
H₂S: It contains one atom of sulphur and two atoms of hydrogen.
HgO: It contains one atom of mercury and one atom of oxygen.
MgCl₂: It contains one atom of magnesium and two atoms of chlorine.
PbS: It contains one atom of lead and one atom of sulphur.

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