Grade 11: CHAPTER2 GROUP 2 ELEMENTS SEMESTER2

Properties of the Alkaline Earth Metals

FIRST IONIZATION ENERGY OF GROUP 2 METALS

First ionization energy decreases going down Group 2

Element	Proton number	Symbol	First ionisation energy (kJ/mol)
Beryllium	4	Be	900
Magnesium	12	Mg	738
Calcium	20	Ca	590
Strontium.	38	Sr	550
Barium	56	Ba	503

Uses of barium sulphate

Barium is used to emphasize organs in x-rays

EXTRA QUESTIONS.

1. State Mendeleev’s periodic law.

2. State Modern periodic law

3. Prove that Li Na K belongs to triads.

4. Explain Mendeleev’s periodic table.

5.Explain Modern periodic table.

6.Why K is more reactive than Na?

7.Why carbon ,silicon have high melting and boiling points.?

8.Write the equations for the decomposition of calcium carbonate and magnesium carbonate.

9.How the thermal stability of nitrates and carbonates changes down group 2

10. How solubility and alkalinity of hydroxide changes down the group2

11. List the uses of Mg O , CaCO₃& BaSO₄

12. Explain the trends of the following properties across a period

a. electro negativity

b. atomic radius.

13.Explain the trend in the following graph of atomic radius and atomic number.