Periodic Table Group 2: Alkaline Earth Metals - JEEPeriodic Table Group 2: Alkaline Earth Metals - JEEUntitled Flashcards Set

Group 2 Elements

Beryllium (Be), Magnesium (Mg), Calcium (Ca), Strontium (Sr), Barium (Ba), and Radium (Ra) with the electronic configuration [Noble gas] ns².

Electronegativity trend in Group 2

Electronegativity decreases down the group (Be > Mg > Ca > Sr > Ba > Ra).

Assertion: The basic character of oxides in Group 2 increases down the group. Reason: BeO is amphoteric while others are basic.

Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.

What is the most common oxidation state of Group 2 elements?

+2 is the most stable oxidation state for Group 2 elements.

First Ionization Energy trend in Group 2

First Ionization Energy decreases down the group due to increasing atomic size and shielding effect.

How does the density of Group 2 elements change down the group?

Density increases down the group.

Which Group 2 hydroxide is amphoteric?

Be(OH)₂ is amphoteric.

For which compound does the thermal stability increase down Group 2?

Thermal stability of carbonates (MCO₃) increases down the group.

What color does calcium produce in a flame test?

Calcium produces a brick red color in a flame test.

Provide the reaction of magnesium with water.

Mg + 2H₂O → Mg(OH)₂ + H₂.

What is a characteristic feature of BeF₂ compared to other Group 2 fluorides?

BeF₂ is covalent, while other fluorides are ionic.

Assertion: Barium sulfate (BaSO₄) is insoluble in water. Reason: High lattice energy makes it insoluble.

Both Assertion and Reason are true, and Reason is the correct explanation for Assertion.

What is the impact of atomic size on ionization energy in Group 2?

As atomic size increases down the group, ionization energy decreases.

What happens to the hardness of Group 2 metals down the group?

Hardness decreases down the group.

What is the reaction of Group 2 metals with acids?

M + 2HCl → MCl₂ + H₂ where M is the Group 2 metal.

Why does Beryllium exhibit anomalous behavior in Group 2?

Due to its small size and high charge density leading to a tendency for covalent bonding.

Which reaction indicates the reducing nature of Group 2 metals?

M + 2H₂O → M(OH)₂ + H₂.

Identify the Group 2 metal that plays a significant role in chlorophyll.

Magnesium is essential for chlorophyll.

What happens to the solubility of Group 2 hydroxides as you move down the group?

Solubility increases down the group.

What is the decomposition reaction for Group 2 carbonates?

MCO₃ → MO + CO₂.

Higher-order question: Compare the thermal decomposition of carbonates and hydroxides in Group 2. How do their stability trends differ?

Group 2 carbonates generally show increased thermal stability down the group, while hydroxides show increased decomposition temperatures also down the group.

Example of qualitative analysis for Group 2 elements identification

Precipitation reactions help in identifying Group II cations.

Application question: How is barium used in medical imaging?

Barium is used in X-ray imaging as a radiocontrast agent.