Post on 09-Aug-2020
Ionic Bonds
Science of Technology
The Periodic Table and Atomic RadiusWhat is happening here
Atoms are getting smaller…why?
When you add more electrons to the same
energy level they are closer to the protons!
Atoms are getting bigger…why?
When you move down the table you are
adding MORE ENERGY LEVELS! So
electrons are further away from the
protons
Please watch the
“Atomic Radius” video
tutorial found on our
class page
Valence Electrons
Valence electrons are the electrons in the
highest occupied energy level of the atom.
Valence electrons are the only electrons
generally involved in bond formation.
You need to understand this chart!!!!
A Positive Ion (Cation)
A Negative Ion (Anion)
Elements within the same group have
the same electron-dot structure.
Chlorine Atom Chlorine Ion
When the valence shell is full, the
atom is stable, less likely to react.
Example: Noble (Inert Gases)
Kr
A Stable Octet
Naming cations (+).
Use the name of the metal.
Example: Na+
Sodium ion.
Naming Anions(-)
Use the name of the nonmetal with the
ending –ide.
Example: F-
Fluoride
Naming Ionic Compounds,
a First Look
Example: NaF
Sodium Fluoride
Ionic Bonds
Bonds that are formed by transfer of
electrons from one element to the other.
Each element (now an ion) will have a
complete octet after the transfer of electrons.
The Ionic Bond
• The electrical force of attraction between
oppositely charged ions.
Na+ F−
Formula Unit
A chemical formula that shows the
lowest whole number ratio of the
atoms (ions) in an ionic compound.
Example: KCl, Mg Cl2
The formula unit is used because ionic
compounds have a lattice arrangement
of ions. Ex: NaCl
Characteristics of Ionic
Bonds
Complete the practice problems
worksheet
NaCl
Sodium Chloride
Cation + Anion -
MgO
Cation + Anion -
Magnesium
Oxide