Which of the following atom does not contain the same number of protons and neutrons in its nucleus?

Options

A. Carbon
B. Deuterium
C. Tritium
D. Nitrogen

Explanation

To determine which atom does not contain the same number of protons and neutrons in its nucleus, we will analyze the given atoms step by step.

### Step 1: Identify the Atoms and Their Atomic Numbers and Mass Numbers
We will consider the following atoms:
- Carbon (C)
- Deuterium (D or ²H)
- Tritium (T or ³H)
- Nitrogen (N)

### Step 2: Write Down the Atomic Numbers and Mass Numbers
- **Carbon (C)**:
- Atomic Number (Z) = 6
- Mass Number (A) = 12
- **Deuterium (²H)**:
- Atomic Number (Z) = 1
- Mass Number (A) = 2
- **Tritium (³H)**:
- Atomic Number (Z) = 1
- Mass Number (A) = 3
- **Nitrogen (N)**:
- Atomic Number (Z) = 7
- Mass Number (A) = 14

### Step 3: Calculate the Number of Protons and Neutrons
- The number of protons (p) in an atom is equal to its atomic number (Z).
- The number of neutrons (n) can be calculated using the formula:
\[ n = A - Z \]

#### For Carbon (C):
- Protons (p) = 6
- Neutrons (n) = 12 - 6 = 6

#### For Deuterium (²H):
- Protons (p) = 1
- Neutrons (n) = 2 - 1 = 1

#### For Tritium (³H):
- Protons (p) = 1
- Neutrons (n) = 3 - 1 = 2

#### For Nitrogen (N):
- Protons (p) = 7
- Neutrons (n) = 14 - 7 = 7

### Step 4: Compare the Number of Protons and Neutrons
Now we compare the number of protons and neutrons for each atom:
- **Carbon (C)**: p = 6, n = 6 (same)
- **Deuterium (²H)**: p = 1, n = 1 (same)
- **Tritium (³H)**: p = 1, n = 2 (not the same)
- **Nitrogen (N)**: p = 7, n = 7 (same)

### Conclusion
The only atom that does not contain the same number of protons and neutrons is **Tritium (³H)**.

### Final Answer
**Tritium (³H)** is the atom that does not contain the same number of protons and neutrons in its nucleus.

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