The correct order of increasing atomic size of element N F Si & P.

Options

A. `NltFltSiltP`
B. `FgtNltPltSi`
C. `FltNltPltSi`
D. `FltNltSiltP`

Answer

To determine the correct order of increasing atomic size for the elements Nitrogen (N), Fluorine (F), Silicon (Si), and Phosphorus (P), we can follow these steps:

### Step 1: Understand the Periodic Trends
- Atomic size (or atomic radius) generally decreases as you move from left to right across a period in the periodic table due to an increase in effective nuclear charge.
- Atomic size increases as you move down a group because additional electron shells are added, which increases the distance of the outermost electrons from the nucleus.

### Step 2: Identify the Position of Each Element
- **Nitrogen (N)** is in Group 15 and Period 2.
- **Fluorine (F)** is in Group 17 and Period 2.
- **Silicon (Si)** is in Group 14 and Period 3.
- **Phosphorus (P)** is in Group 15 and Period 3.

### Step 3: Compare Atomic Sizes
1. **Fluorine (F)**: Being in Group 17 and Period 2, it has the smallest atomic size due to its high effective nuclear charge and being in the same period as N.
2. **Nitrogen (N)**: Also in Period 2 but in Group 15, it has a larger atomic size than F but smaller than P and Si.
3. **Phosphorus (P)**: In Group 15 and Period 3, it has a larger atomic size than both N and F due to being in a lower period.
4. **Silicon (Si)**: In Group 14 and Period 3, it has the largest atomic size among the four elements due to its position in the periodic table.

### Step 4: Arrange in Order of Increasing Atomic Size
Based on the above comparisons, we can arrange the elements in order of increasing atomic size:
- **Fluorine (F) < Nitrogen (N) < Phosphorus (P) < Silicon (Si)**

### Final Answer
The correct order of increasing atomic size is:
**F < N < P < Si**

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