
Concept explainers
a)
Interpretation:Name and formula of compound formed from sodium and oxygen should be given.
Concept introduction:A chemical formula tells number of atoms of each element in the compound.In molecular formula, exact number and type of atoms are shown.In molecular symbol, number of each atom is written in the subscript.
Atoms gain or lose electrons to form compound.A combination of atoms to form a compound depends on their valency.
b)
Interpretation:Name and formula of compound formed from oxygen and strontium should be given.
Concept introductionA chemical formula tells number of atoms of each element in the compound.In molecular formula, exact number and type of atoms are shown.In molecular symbol, number of each atom is written in the subscript.
Atoms gain or lose electrons to form compound. A combination of atoms to form a compound depends on their valency.
c)
Interpretation:Name and formula of compound formed from aluminium and chlorine should be given.
Concept introduction:A chemical formula tells number of atoms of each element in the compound.In molecular formula, exact number and type of atoms are shown.In molecular symbol, number of each atom is written in the subscript.
Atoms gain or lose electrons to form compound. A combination of atoms to form a compound depends on their valency.

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Chapter 2 Solutions
Principles of General Chemistry
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