Which of the given elements A,B,C,D and E with atomic number 2,3,7,10 and 30 respectively belong to the same period ?

Options

A. A,B,C
B. B,C,D
C. A,D,E
D. B,D,E

Explanation

To determine which of the given elements A, B, C, D, and E belong to the same period based on their atomic numbers (2, 3, 7, 10, and 30), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Elements**:
- Atomic number 2 corresponds to Helium (He).
- Atomic number 3 corresponds to Lithium (Li).
- Atomic number 7 corresponds to Nitrogen (N).
- Atomic number 10 corresponds to Neon (Ne).
- Atomic number 30 corresponds to Zinc (Zn).

2. **Determine the Periods**:
- The periodic table is arranged in periods (rows) based on the number of electron shells.
- The first period contains elements with atomic numbers 1 and 2 (Hydrogen and Helium).
- The second period contains elements with atomic numbers 3 to 10 (Lithium to Neon).
- The third period contains elements with atomic numbers 11 to 18 (Sodium to Argon).
- The fourth period starts from atomic number 19 and goes up to 36 (Potassium to Krypton).

3. **Locate the Elements in Their Periods**:
- Helium (He, atomic number 2) is in the **first period**.
- Lithium (Li, atomic number 3), Nitrogen (N, atomic number 7), and Neon (Ne, atomic number 10) are all in the **second period**.
- Zinc (Zn, atomic number 30) is in the **fourth period**.

4. **Identify Elements in the Same Period**:
- From the above analysis, the elements that belong to the same period (second period) are:
- B (Lithium, atomic number 3)
- C (Nitrogen, atomic number 7)
- D (Neon, atomic number 10)

5. **Conclusion**:
- The elements that belong to the same period are B, C, and D.

### Final Answer:
The elements that belong to the same period are **B (Lithium), C (Nitrogen), and D (Neon)**.

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