Which of the following uni-positive ions possesses all the three sub-atomic particles

Options

A. Helium
B. Deuterium
C. Tritium
D. Hydrogen

Answer

To determine which of the following uni-positive ions possesses all three sub-atomic particles (protons, neutrons, and electrons), we will analyze the given ions step by step.

### Step-by-Step Solution:

1. **Understanding Uni-Positive Ions**:
- A uni-positive ion (denoted as X⁺) has lost one electron compared to its neutral atom. Therefore, it will have one less electron than the neutral atom.

2. **Identifying Sub-Atomic Particles**:
- Sub-atomic particles include protons, neutrons, and electrons.
- Protons are positively charged and are equal to the atomic number of the element.
- Neutrons are neutral particles found in the nucleus, and their number can be calculated using the mass number (protons + neutrons).

3. **Analyzing Helium Ion (He⁺)**:
- Helium (He) has an atomic number of 2, meaning it has 2 protons and 2 electrons in its neutral state.
- For He⁺, it loses one electron, leaving it with 1 electron.
- The mass number of helium is 4 (2 protons + 2 neutrons), so it has 2 neutrons.
- Conclusion: He⁺ has 2 protons, 2 neutrons, and 1 electron. **(All three sub-atomic particles are present)**.

4. **Analyzing Deuterium Ion (D⁺)**:
- Deuterium (D) is an isotope of hydrogen with an atomic number of 1 and a mass number of 2.
- D⁺ loses one electron, leaving it with 0 electrons.
- It has 1 proton and 1 neutron (mass number - protons = neutrons).
- Conclusion: D⁺ has 1 proton, 1 neutron, and 0 electrons. **(Missing one sub-atomic particle)**.

5. **Analyzing Tritium Ion (T⁺)**:
- Tritium (T) is another isotope of hydrogen with an atomic number of 1 and a mass number of 3.
- T⁺ loses one electron, leaving it with 0 electrons.
- It has 1 proton and 2 neutrons (mass number - protons = neutrons).
- Conclusion: T⁺ has 1 proton, 2 neutrons, and 0 electrons. **(Missing one sub-atomic particle)**.

6. **Analyzing Hydrogen Ion (H⁺)**:
- Hydrogen (H) has an atomic number of 1 and a mass number of 1.
- H⁺ loses its only electron, leaving it with 0 electrons.
- It has 1 proton and 0 neutrons (mass number - protons = neutrons).
- Conclusion: H⁺ has 1 proton, 0 neutrons, and 0 electrons. **(Missing two sub-atomic particles)**.

### Final Conclusion:
- Among the ions analyzed, only **He⁺** possesses all three sub-atomic particles: protons, neutrons, and electrons.