22 Periodic
, Reactions of Period 3 Elements with Water
Magnesium:
• Reacts very slowly at room temperature
• Only a few bubbles of hydrogen gas is formed after
days of reacting
Sodium: • Produces a less alkaline solution than sodium as
• Vigorous reaction magnesium hydroxide is sparingly soluble in water
• Sodium sits on the top of the water and fizzes rapidly
0 +1 -2 +2 -2 +1 0
• An alkaline solution of sodium hydroxide is formed Mg (s) + 2H2O (l) → Mg(OH)2 (aq) + H2 (g)
0 +1 -2 +1 -2 +1 0
2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g) • The reaction is much faster with heated magnesium
and steam, which produces magnesium oxide and
hydrogen
0 +1 -2 +2 -2 0
Mg (s) + H20 (g) → MgO(s) + H2 (g)
, Reactions of Period 3 Elements with Water
Magnesium:
• Reacts very slowly at room temperature
• Only a few bubbles of hydrogen gas is formed after
days of reacting
Sodium: • Produces a less alkaline solution than sodium as
• Vigorous reaction magnesium hydroxide is sparingly soluble in water
• Sodium sits on the top of the water and fizzes rapidly
0 +1 -2 +2 -2 +1 0
• An alkaline solution of sodium hydroxide is formed Mg (s) + 2H2O (l) → Mg(OH)2 (aq) + H2 (g)
0 +1 -2 +1 -2 +1 0
2Na (s) + 2H2O (l) → 2NaOH (aq) + H2 (g) • The reaction is much faster with heated magnesium
and steam, which produces magnesium oxide and
hydrogen
0 +1 -2 +2 -2 0
Mg (s) + H20 (g) → MgO(s) + H2 (g)
