Arrange the followign metals in the decreasing order to reactivity Na, K, Cu` and Ag.

Options

A. `NagtKgtCgtAg`
B. `KgtCugtNagtAg`
C. `Ag gtCugtNagtK`
D. `K gt NagtCugtAg`

Explanation

To arrange the metals sodium (Na), potassium (K), copper (Cu), and silver (Ag) in decreasing order of reactivity, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Reactivity Series**: The reactivity series is a list of metals arranged in order of decreasing reactivity. The more reactive a metal is, the more easily it will react with other substances.

2. **Identify the Metals**: The metals we need to arrange are:
- Sodium (Na)
- Potassium (K)
- Copper (Cu)
- Silver (Ag)

3. **Determine the Position of Each Metal in the Reactivity Series**:
- Potassium (K) is an alkali metal and is highly reactive.
- Sodium (Na) is also an alkali metal but is less reactive than potassium.
- Copper (Cu) is a transition metal and is less reactive than both sodium and potassium.
- Silver (Ag) is also a transition metal and is even less reactive than copper.

4. **Rank the Metals**: Based on the reactivity series:
- Potassium (K) is the most reactive.
- Sodium (Na) comes next.
- Copper (Cu) follows sodium.
- Silver (Ag) is the least reactive.

5. **Write the Final Order**: Thus, the decreasing order of reactivity for the metals is:
- K > Na > Cu > Ag

### Final Answer:
**K > Na > Cu > Ag**