In the same way, the chemical name of magnesia is magnesium oxide i.e. combination of Mg and O. Mercuric sulfide is the chemical name of cinnabar, i.e. Hg and S. Nitrous oxide is the chemical name of laughing gas, i.e. of N and O, and cupric sulfate is the chemical name of blue vitriol, i.e. Cu, S and O.

Chemical names are combination of two elements used in its formation and in the last 'ide' is attached to the name of second element. For example, sodium and chlorine becomes sodium chloride. However, the use -ic with first element shows that first element has combined with second element in large quantity while -ous determines that first element has combined with second element in small quantity. For example, mercuric sulfide shows that mercury is combined with more sulfur while mercurous sulfide shows that mercury is combined with less sulfur.

Roman numerals reveal the oxidation state of the element. For example, iron (III) oxide says that iron is in a +3 state with oxygen and iron (II) oxide says that iron is in a +2 state with oxygen.

Chemical names end with -ate shows that oxygen has combined with two other elements. For example, the chemical name cupric sulfate is the combination of copper with sulfur and oxygen.

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