Characterstic feature of alkali metals is

Options

A. good conductor of heat and electricity
B. High melting point
C. Low oxidation potentials
D. High ionization potentials

Explanation

To answer the question regarding the characteristic features of alkali metals, let's break down the characteristics step by step.

### Step-by-Step Solution:

1. **Definition of Alkali Metals**:
Alkali metals are the elements found in Group 1 of the periodic table, which includes lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).

2. **Softness**:
Alkali metals are known for being soft. This softness is due to the weak metallic bonding present in these metals, which allows them to be cut easily with a knife.

3. **Low Melting and Boiling Points**:
Compared to most other metals, alkali metals have relatively low melting and boiling points. This is a characteristic feature that distinguishes them from other metallic elements.

4. **High Oxidation Potential**:
Alkali metals have a high oxidation potential, meaning they readily lose their outermost electron to form positive ions (cations). This property makes them highly reactive.

5. **Good Conductors of Heat and Electricity**:
Alkali metals are also good conductors of heat and electricity due to the presence of free-moving electrons in their metallic structure.

6. **Reactivity**:
Alkali metals are highly reactive, especially with water and halogens. Their reactivity increases down the group, with cesium being the most reactive.

### Conclusion:
The characteristic features of alkali metals include their softness, low melting and boiling points, high oxidation potential, good conductivity of heat and electricity, and high reactivity.