Transcript Slide 1

Ions & Ionic Bonds
Packet #14
Introduction
• An atom, as previously mentioned, has a certain number
of protons and, in most cases, an equal number of
electrons surrounding the nucleus.
• Results in a balance of charges
• Zero net charge
• However, a charged entity can be formed by adding or
removing one or more electrons.
• Forming an ion
Cation vs. Anion
TYPES OF IONIC BONDS
Cation
• A positive ion is called
a cation.
• It is produced when a
neutral atom has lost
one or more atoms.
• Atom has a net positive
charge.
Anion
• An anion is a negative ion.
• It is produced when a
neutral atom has gained
one or more electrons.
• Atom has a net negative
charge
Anion—Naming
•
The name of an anion is
obtained by adding –ide to the
root of the atom name.
• Flourine
• F + e- = F• Flouride
• Bromine
• Br + e- = Br• Bromide
• Anions that have gained
two electrons, oxide and
sulfide for example, are
named in the similar
manner.
Ionic Bond
• A bond that is formed
by the attraction of
two ions (cation &
anion) of opposite
charge
• Cation
• Positive charge
• Anion
• Negative charge
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Ionic Bond II
Ionic Bond III
Ions
• Please note: -Ions are
formed by the changed in
the number of electrons—
never by the change in the
number of protons.
• Most ions are formed
when metallic elements
combine with nonmetallic
elements.
PROPERTIES OF IONIC
COMPOUNDS
Properties of Ionic Compounds
• Most are crystalline solids
at room temperature
• Ionic compounds
generally have high
melting points
• NaCl has a melting point of
800˚C
• Ionic compounds can
conduct an electric
current when melted or
dissolved in water.
Fluorite (CaF2)
Grossularite (Ca3Al2(SiO4)3)
Aragonite (CaCO3)
Beryl (BeAl2(SiO3)6)
Hematite (Fe2O3)
Cinabar (HgS)
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