1. Chapter:11
Group 2 Element
Name: Mohammad Atif Stanikzai & Arash Faisal
Teacher: Fareed Gul Shenwari
Class: 11th
Year: 2023
Date: 27:5:2023
2. Chapter:11
Group 2 Element
Contents
• 11.1 Physical properties of Group 2 elements
• 11.2 Reactions of Group 2 elements
• 11.3 Reactions with oxygen
• 11.4 Reactions with water
3. 11.1 Physical Properties of Group 2 Element
The group 2 alkaline earth metals include Beryllium, Magnesium,
Calcium, Barium, Strontium and Radium and are soft, silver metals
that are less metallic in character than the Group 1 Alkali Metals.
4. Physical Properties of Group 2 Element
I. Low density (mass over volume).
II. Low melting points (except Beryllium).
III.Low boiling point (except Beryllium).
IV.Soft and strong in their metal states.
V. Malleable.
VI.Shiny and silvery as metals.
VII. etc….
5.
6. 11.2 Reaction of Group 2 Element
The group 2 elements get more reactive going down the group.
I. Ionic radius increases.
II.Charge stay the same.
III.Charge density increases.
IV. polarizing power increases.
7. Reaction with oxygen
• Group 2 elements burn in air and more rapidly
in oxygen gas.
• Group 2 elements get more reactive as you go
down the group.(because larger atoms lose
electrons easily)
• Ex: Mg+O2+=2MgO
• When burnt they lose 2 electron and get 2+
charge.
• These elements give color flames when burn.
beryllium
Magnesium
Calcium
Strontium
Barium
radium
8. Flame test
• We can test for calcium, strontium and barium ions in compound using
flame test.
• A nichrome wire , cleaned with concentrated HCL is dipped into a sample
salt to be heated in a non luminous Bunsen burner.
• Calcium ----- brick red color
• Strontium----- red color
• Barium--------- green color
9. Reaction of oxides with dilute acid
• Basic oxides of group 2 element can be neutralized by dilure acid.
• General equation is:
basic oxode+ dilute acid----- salt+water
• Ex: MgO+2HCl----- MgCl2+H2O
• Oxides of calcium(CaO), strontium(SrO) and barium (BrO) can be also neutralized
by dilute HCl.
• Same reaction occurs with sulfuric acid but sulfate solution is formed
• Ex : MgO+H2SO4----MgSO4+H2O
