The reactivity of IA elements is due to-

Options

A. Low I.P.
B. Large atomic size
C. Low heat of atomization
D. All the above

Answer

To determine the reactivity of IA elements (alkali metals), we can analyze the properties that contribute to their high reactivity. Here’s a step-by-step breakdown of the reasoning:

### Step 1: Identify the Group
- The IA elements are known as alkali metals, which include lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

**Hint:** Remember that alkali metals are located in Group 1 of the periodic table.

### Step 2: Understand Ionization Energy
- Alkali metals have low ionization energies, which means they can easily lose their outermost electron. This is a crucial factor for their reactivity, as losing an electron allows them to achieve a stable noble gas configuration.

**Hint:** Consider how the ease of losing an electron relates to reactivity.

### Step 3: Consider Atomic Size
- The atomic size of alkali metals is relatively large. As the atomic size increases, the distance between the nucleus and the outermost electron also increases. This results in weaker nuclear attraction on the outer electron, making it easier to remove.

**Hint:** Think about how distance affects the strength of attraction between the nucleus and electrons.

### Step 4: Evaluate Heat of Atomization
- The heat of atomization is the energy required to break the bonds between atoms. Alkali metals have low heat of atomization, meaning that the bonds can be broken easily, contributing to their reactivity.

**Hint:** Reflect on how the energy required to break bonds influences the reactivity of elements.

### Step 5: Conclusion
- All of the properties discussed (low ionization energy, large atomic size, and low heat of atomization) contribute to the high reactivity of alkali metals. Therefore, the answer to the question is that the reactivity of IA elements is due to all of these properties.

**Final Answer:** The reactivity of IA elements is due to low ionization energy, large atomic size, and low heat of atomization.