periodic table - denton · pdf fileperiodic table metalloids border the stair-step line (with...
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![Page 1: Periodic Table - Denton · PDF filePeriodic Table Metalloids border the stair-step line (with the exception of Al, Po, and At). Atoms, Molecules, and Ions ... Patterns in Oxyanion](https://reader031.vdocuments.mx/reader031/viewer/2022030418/5aa4c7b97f8b9ab4788c4f50/html5/thumbnails/1.jpg)
Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Periodic Table
• The rows on the
periodic chart are
periods.
• Columns are groups.
• Elements in the same
group have similar
chemical properties.
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Groups
These five groups are known by their names.
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Periodic Table
Nonmetals are
on the right
side of the
periodic table
(with the
exception of
H).
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Periodic Table
Metalloids
border the
stair-step line
(with the
exception of
Al, Po, and
At).
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Periodic Table
Metals are
on the left
side of the
chart.
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Chemical 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.
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Chemical Formulas
Molecular compounds
are composed of
molecules and almost
always contain only
nonmetals.
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Diatomic Molecules
These seven elements occur naturally as
molecules containing two atoms.
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
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.
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Types of Formulas
• Structural formulas show the
order in which atoms are
bonded.
• Perspective drawings also
show the three-dimensional
array of atoms in a
compound.
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Ions
• When atoms lose or gain electrons, they
become ions.
– Cations are positive and are formed by elements
on the left side of the periodic chart.
– Anions are negative and are formed by elements
on the right side of the periodic chart.
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Ionic Bonds
Ionic compounds (such as NaCl) are
generally formed between metals and
nonmetals.
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Writing Formulas
• Because compounds are electrically neutral,
one can determine the formula of a
compound this way:
– The charge on the cation becomes the subscript
on the anion.
– The charge on the anion becomes the subscript
on the cation.
– If these subscripts are not in the lowest whole-
number ratio, divide them by the greatest common
factor.
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Common Cations
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Common Anions
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Inorganic Nomenclature
• Write the name of the cation.
• If the anion is an element, change its
ending to -ide; if the anion is a
polyatomic ion, simply write the name of
the polyatomic ion.
• If the cation can have more than one
possible charge, write the charge as a
Roman numeral in parentheses.
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Patterns in Oxyanion Nomenclature
• When there are two oxyanions involving
the same element:
– The one with fewer oxygens ends in -ite.
• NO2− : nitrite; SO3
2− : sulfite
– The one with more oxygens ends in -ate.
• NO3− : nitrate; SO4
2− : sulfate
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Patterns in Oxyanion
Nomenclature
• The one with the second fewest oxygens ends in -ite.
– ClO2− : chlorite
• The one with the second most oxygens ends in -ate.
– ClO3− : chlorate
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Patterns in Oxyanion Nomenclature
• The one with the fewest oxygens has the prefix hypo-
and ends in -ite.
– ClO− : hypochlorite
• The one with the most oxygens has the prefix per- and
ends in -ate.
– ClO4− : perchlorate
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Acid Nomenclature
• If the anion in the acid
ends in -ide, change
the ending to -ic acid
and add the prefix
hydro- .
– HCl: hydrochloric acid
– HBr: hydrobromic acid
– HI: hydroiodic acid
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Acid Nomenclature
• If the anion in the acid
ends in -ite, change
the ending to -ous
acid.
– HClO: hypochlorous
acid
– HClO2: chlorous acid
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Acid Nomenclature
• If the anion in the acid
ends in -ate, change
the ending to -ic acid.
– HClO3: chloric acid
– HClO4: perchloric acid
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Nomenclature of Binary
Compounds
• The less electronegative atom is usually listed first.
• A prefix is used to denote the number of atoms of each element in the compound (mono- is not used on the first element listed, however) .
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Nomenclature of Binary
Compounds
• The ending on the more
electronegative element
is changed to -ide.
– CO2: carbon dioxide
– CCl4: carbon tetrachloride
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Nomenclature of Binary
Compounds
• If the prefix ends with aor o and the name of the element begins with a vowel, the two successive vowels are often elided into one.
N2O5: dinitrogen pentoxide
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Nomenclature of Organic
Compounds
• Organic chemistry is the study of carbon.
• Organic chemistry has its own system of
nomenclature.
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Nomenclature of Organic
Compounds
The simplest hydrocarbons (compounds
containing only carbon and hydrogen) are
alkanes.
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Nomenclature of Organic
Compounds
The first part of the names above correspond
to the number of carbons (meth- = 1, eth- = 2,
prop- = 3, etc.).
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Atoms,
Molecules,
and Ions
© 2009, Prentice-Hall, Inc.
Nomenclature of Organic
Compounds
• When a hydrogen in an alkane is replaced with
something else (a functional group, like -OH in
the compounds above), the name is derived from
the name of the alkane.
• The ending denotes the type of compound.
– An alcohol ends in -ol.