(a),(b) and (c) are elements in the second short period. Oxide of (a) is ionic, that of (b) is amphoteric and of (c) of gaint molecule. (a),(b) and (c) have atomic number in the order-

Options

A. (A)lt(B)lt(C)
B. (C)lt(B)lt(A)
C. (A)lt(B)lt(B)
D. (B)lt(A)lt(C)

Explanation

To solve the problem, we need to identify the elements A, B, and C based on the characteristics of their oxides and their positions in the second period of the periodic table.

### Step-by-Step Solution:

1. **Identify the Elements in the Second Period:**
The elements in the second period of the periodic table are:
- Lithium (Li) - Atomic number 3
- Beryllium (Be) - Atomic number 4
- Boron (B) - Atomic number 5
- Carbon (C) - Atomic number 6
- Nitrogen (N) - Atomic number 7
- Oxygen (O) - Atomic number 8
- Fluorine (F) - Atomic number 9
- Neon (Ne) - Atomic number 10

2. **Analyze the Oxides:**
- **Element A:** The oxide of A is ionic. In the second period, Lithium (Li) forms an ionic oxide (Li2O).
- **Element B:** The oxide of B is amphoteric. Beryllium (Be) forms an amphoteric oxide (BeO).
- **Element C:** The oxide of C is a giant molecule. Carbon (C) forms giant molecular structures (like diamond and graphite).

3. **Assign Elements to A, B, and C:**
Based on the characteristics of their oxides:
- A = Lithium (Li) (ionic oxide)
- B = Beryllium (Be) (amphoteric oxide)
- C = Carbon (C) (giant molecular oxide)

4. **Determine the Order of Atomic Numbers:**
Now, we can list the atomic numbers of the identified elements:
- A (Li) = 3
- B (Be) = 4
- C (C) = 6

Therefore, the order of atomic numbers for A, B, and C is:
**3 (Li), 4 (Be), 6 (C)**

### Final Answer:
The atomic numbers of elements A, B, and C in order are 3, 4, and 6.

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