Atoms, Molecules, And Ions Worksheet - Chapter 2 Page 12
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27Chemical Formulas
• The subscript to the right of the
symbol of an element tells the
number of atoms of that element
in one molecule of the compound.
• Molecular compounds often
contain only nonmetals.
• The attraction between molecules
are often relatively weak,
explaining why gases and liquids
are common among molecular
substances.
• Carbon is typically listed first in
the formula, unless C is part of a
polyatomic ion.
Types of Formulas
• Empirical formulas
give the
lowest whole-number ratio of
atoms of each element in a
compound.
• Molecular formulas
give the
exact number of atoms of each
element in a compound.
• Structural formulas
show the
order in which atoms are
bonded.
• Perspective drawings
also show
the three-dimensional shape of
atoms in a compound.
12
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