JEE Main and JEE Advanced:

1. Atomic Radii:

• Remember the atomic radii trend (increases down the group).
• For a quick estimation, the atomic radii of Group 2 elements can be approximated as 2 times the ionic radii.

2. Ionic Radii:

• The ionic radii increase down the group due to the shielding effect of the added energy levels.

3. Ionization Enthalpy:

• Ionization enthalpy decreases down the group due to increasing atomic size and decreasing electronegativity.
• For a rough estimate, the second ionization enthalpy is usually 2-3 times the first ionization enthalpy.

4. Melting Point:

• The melting point increases down the group due to stronger metallic bonding.
• For a quick approximation, the melting point of a Group 2 element can be estimated by adding 100°C per period (moving down a row) and 100°C per group (moving from left to right).

5. Boiling Point:

• The boiling point increases down the group due to increased metallic bonding and molecular mass.
• Similar to melting point estimation, you can add approximately 200°C per period and 100°C per group.

CBSE Board Exams:

1. General Properties

• Remember the key properties: shiny, silvery-white, soft, malleable, reactive with air/water/acids, and form basic oxides/hydroxides.

2. Reactions

• Master the reaction patterns with oxygen (oxides), water (hydroxides), and acids (salts + H2).

3. Compounds

• Memorize a few common compounds (like calcium carbonate, magnesium sulfate) and their uses (e.g., cement, fertilizers).

4. Uses

• Familiarize yourself with practical applications of Group 2 elements, especially in industries like construction, metallurgy, and agriculture.