Ionization energy &
electronic affinity
team members
Sofia Parral
Ivana Guerrero
Valeria López
Renata Manrique
Gabriela Zúñiga
Camila Gómez
Valeria Pastrana
ionization energy
Is the amount of energy required to
dislodge the electron with the
weakest nuclear force of attraction
Therefore an atom, losing an electron,
becomes a positively charged ion
(cation) because the number of protons
is bigger than the number of its
electrons.
atom + energy
The energy required to dislodge the
least strongly attached electron from
an atom is known as the first ionization
energy. More energy is required to
dislodge each additional electron, that
is, the second and third ionization
energy; this is because the positive
charge increases by one unit with each
subsequent electron that is removed.
0
Na(g) + energy
cation + electron
Na+(g) + e
Ionization energy
In the periodic table,
the ionization energy
of elements increases
from left to right
within a period and
decreases from top to
bottom within a group.
Electron affinity
Electron affinity is the amount of energy
released when an atom in a gas state wins
an extra electron.
It becomes a negative ion (anion):
Atom + electron
Cl + e
=
=
Anion + energy
Cl- + energy
In the periodic table,
electron affinity increases
from left to right within a
period and decreases from
top to bottom within a
group.
Decreases
electron affinity
¡Thank you!