Name the best and the poorest conductor of current among metals.

Explanation

To answer the question about the best and poorest conductor of current among metals, we can follow these steps:

### Step 1: Identify the Best Conductor of Electricity
- Among metals, **silver** is known to be the best conductor of electricity. This is due to its high number of free electrons, which facilitate the flow of electric current.

### Step 2: Explain Why Silver is the Best Conductor
- The conductivity of a metal is largely determined by the number of free electrons available for conduction. Silver has the highest number of free electrons compared to other metals, allowing it to conduct electricity more efficiently.

### Step 3: Identify the Poorest Conductor of Electricity
- On the other hand, **lead** is recognized as one of the poorest conductors of electricity among metals.

### Step 4: Explain Why Lead is the Poorest Conductor
- Lead has a significantly lower number of free electrons compared to other metals, which results in its poor conductivity. The fewer the free electrons, the less capable the metal is of conducting electric current.

### Conclusion
- Therefore, the best conductor of current among metals is **silver**, and the poorest conductor is **lead**.

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