Correct decreasing order of atomic weight is correct of the elements given below is

Options

A. `Fe gt Co gt Ni`
B. `Ni gt Co gt Fe`
C. `Co gt Ni gt Fe `
D. `Co gt Fe gt Ni `

Answer

To determine the correct decreasing order of atomic weight for the elements iron (Fe), cobalt (Co), and nickel (Ni), we can follow these steps:

### Step 1: Identify the Atomic Weights
First, we need to know the atomic weights of the elements in question:
- **Iron (Fe)**: Atomic weight = 56
- **Cobalt (Co)**: Atomic weight = 59
- **Nickel (Ni)**: Atomic weight = 58.7 (approximately 59)

### Step 2: Compare the Atomic Weights
Next, we compare the atomic weights of the three elements:
- Cobalt (Co) has an atomic weight of 59.
- Nickel (Ni) has an atomic weight of approximately 58.7.
- Iron (Fe) has an atomic weight of 56.

### Step 3: Arrange in Decreasing Order
Now, we arrange the elements in decreasing order based on their atomic weights:
1. Cobalt (59)
2. Nickel (58.7)
3. Iron (56)

### Final Answer
Thus, the correct decreasing order of atomic weights is:
**Cobalt (Co) > Nickel (Ni) > Iron (Fe)**