Magnesium

1
Bohr Model Review
Magnesium
12
N
2 Valence Electrons
FORMULA Max electrons (energy level)2 x 2
2
Valence Electrons
3
Valence Electrons
-Valence electrons are the electrons found in the
____________ energy level of an atom.
outer/highest
4
-There is a pattern on the periodic table for
elements with the same amount of valence
electrons. Elements with the same number of
valence electrons are generally found in the same
___________ on the periodic table.
group
1
8
2
3
4
5
6
7
5
1 v.e.
8 v.e.
H
He
2 v.e.
3 v.e.
4 v.e.
5 v.e.
6 v.e.
7 v.e.
Li
Be
B
C
N
O
F
Ne
Na
Al
Si
Mg
P
S
Cl
Ar
-A common and handy way to show the number of
valence electrons in an atom is to draw
_________________________.
dot structure diagrams
-Each dot represents a valence electron. When
drawing dots you must add them one at a time,
starting with to the right of the symbol, placing
only one on each of the four sides, until all
four sides have a dot. If more need to be
added then you add a second dot to the right side
and continue to add one more dot to each side.
All dots are to be added in a counter-clockwise
direction.
6
1 v.e.
8 v.e.
H
He
2 v.e.
3 v.e.
4 v.e.
5 v.e.
6 v.e.
7 v.e.
Li
Be
B
C
N
O
F
Ne
Na
Al
Si
Mg
P
S
Cl
Ar
-Looking at the Noble gases we can see that they
contain ________ valence electrons. -If you
remember, Noble gases are the most stable of
elements and are the least likely to combine
with other elements to form compounds.
eight
8
THE MAGICAL?
NUMBER ? _______ -In turns out that most
elements envy the noble gases and therefor
want to achieve _____ valence electrons. -In
general, an atom will form a chemical bond with
another atom if the bonding will cause both
atoms to have _________ electrons in their
outer energy level. This is called the
________________ rule.
8
eight
octet