Alkali metals are

Options

A. bad conductors of heat and electricity
B. good conductors of heat and electricity
C. good conductors of heat but bad conductors of electricity
D. semi conductor of heat and electricity

Answer

**Step-by-Step Solution:**

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

2. **Physical Properties:**
Alkali metals are characterized by their softness, malleability, and ductility. This means they can be easily cut, shaped, and stretched into wires.

3. **Valence Electrons:**
Alkali metals have one electron in their outermost shell (valence shell). This single valence electron is loosely bound and can be easily lost during chemical reactions.

4. **Formation of Ions:**
When alkali metals lose their one valence electron, they form positively charged ions (cations). For example, sodium (Na) loses one electron to form Na⁺.

5. **Electrical and Thermal Conductivity:**
Due to the presence of mobile electrons, alkali metals are good conductors of electricity and heat. The free movement of these electrons allows for efficient conduction.

6. **Conclusion:**
Therefore, alkali metals are soft, malleable, ductile, and good conductors of electricity and heat due to their single valence electron that can be easily lost to form ions.

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