Which of the following properties of the elements of group II (alkali earth metals) increase (s) with increasing atomic number?

Options

A. Stability of carbonate
B. Solubility of hydroxide
C. Reactively with water
D. First ionization energy

Answer

To solve the question regarding which properties of group II (alkaline earth metals) increase with increasing atomic number, we will analyze each property mentioned in the video transcript step by step.

### Step 1: Identify the Group II Elements
The alkaline earth metals in group II of the periodic table include:
- Beryllium (Be)
- Magnesium (Mg)
- Calcium (Ca)
- Strontium (Sr)
- Barium (Ba)

### Step 2: Analyze Each Property
1. **Stability of Carbonates**:
- As we move down the group from Be to Ba, the stability of carbonates increases because they become less soluble. Therefore, the stability of carbonates increases with increasing atomic number.

2. **Stability of Hydroxides**:
- The stability of hydroxides also increases down the group. This is due to the decrease in lattice energy, which allows larger metal ions to form more stable hydroxides. Thus, the stability of hydroxides increases with increasing atomic number.

3. **Reactivity with Water**:
- The reactivity of alkaline earth metals with water increases down the group. For example, barium reacts more vigorously with water than magnesium. Therefore, reactivity with water increases with increasing atomic number.

4. **First Ionization Energy**:
- The first ionization energy decreases as we move down the group. This is because larger atomic size and increased shielding effect make it easier to remove the outermost electron. Thus, first ionization energy does not increase with increasing atomic number.

### Conclusion
From the analysis:
- The properties that **increase** with increasing atomic number are:
- Stability of Carbonates
- Stability of Hydroxides
- Reactivity with Water

The property that **does not increase** is:
- First Ionization Energy (it decreases).

### Final Answer
The properties of group II elements that increase with increasing atomic number are:
- Stability of Carbonates
- Stability of Hydroxides
- Reactivity with Water