7. The benefit for our topic
1. You can know about chemical properties of
the element in the third period
2. You can make the reaction from chemical
properties of the element in the third period
3. And then you can explain the example from
chemical properties of the element in the
third period
8. Testing Elements – Elements
Period Third
1. Reaction with Oxygen
a. Sodium
Sodium experience reaction great with oxygen.
4Na (s) + O 2 (g) → 2Na 2 O (s)
b. Magnesium
2Mg (s) + O 2 (g) → 2MgO (s)
c. Aluminum
Aluminum will burning in oxygen if shape powder, on the contrary layer strong oxide on
aluminum tend inhibit the reaction. Aluminum rich oxide white will formed.
4Al + 3O 2 → 2Al 2 O 3
d. Sulfur
Solids Sulfur easy burning in the air moment heated and will produce Sulfur gas Dioxide (SO 2 ).
Oxides this could reacted more continue with oxygen gas catalyzed excess by Vanadium
Pentaoxide (V 2 O 5 ) to produce gas Sulfuroxide (SO 3 ).
9. 2. Reaction with Chlorine
a. Sodium
Sodium burning in chlorine with flame orange lights up. Solids NaCl will formed.
2Na + Cl 2 → 2NaCl
b. Magnesium
Magnesium burns with flame strong white produce magnesium chloride.
Mg + Cl 2 → MgCl 2
c. Aluminum
Aluminum burning in Flow chlorine produce aluminum yellow chloride very pale.
2Al + 3Cl 2 → 2Al Cl 3
10. 3. Reaction with Water
a. Sodium
Sodium experience very reaction exoterm with cold water
produce hydrogen and the solution NaOH is not colored
2Na + 2H 2 O → 2NaOH + H 2
b. Magnesium
Magnesium experienced very reaction slow with cold
water, but burning in water vapor with flame white
characteristic forming magnesium oxide and hydrogen.
Mg + H 2O → MgO + H 2
11. Character Reductor and Oxidizing
agents Elements Period Third
Could concluded from left right,
elements period third have character power
reducer more weak and power oxidant more
strong.
12. Properties Acid and Bases oxide and
hydroxide
Compounds hydroxide element period third
from left to the right character the bases
reduced and character acid increases where as
Al (OH) 3 is amphoter
