Which of the following is correct sequence in terms of increasing mass ?

Options

A. Proton , electron alpha particle , hydrogen atom , alpha particle
B. Electron , proton , hydrogen atom , alpha particle
C. Hydrogen atom , proton , electron ,alpha particle
D. Alpha particle , proton , hydrogen atom , electron

Answer

To determine the correct sequence in terms of increasing mass among the given particles, we need to compare the masses of each particle mentioned in the options.

### Step-by-Step Solution:

1. **Identify the Masses of Each Particle**:
- **Electron**: The mass of an electron is approximately \(9.1 \times 10^{-31}\) kg or \(9.1 \times 10^{-27}\) grams.
- **Proton**: The mass of a proton is approximately \(1.67 \times 10^{-27}\) kg or about \(1\) amu (atomic mass unit).
- **Hydrogen Atom**: The mass of a hydrogen atom (which consists of one proton and one electron) is approximately \(1.008\) amu.
- **Alpha Particle**: An alpha particle is equivalent to a helium nucleus, which contains 2 protons and 2 neutrons, giving it a mass of about \(4\) amu.

2. **Arrange the Particles by Mass**:
- **Electron**: \(9.1 \times 10^{-27}\) grams (least mass)
- **Proton**: \(1\) amu (greater than electron)
- **Hydrogen Atom**: \(1.008\) amu (greater than proton)
- **Alpha Particle**: \(4\) amu (greatest mass)

3. **Determine the Increasing Order**:
- The increasing order of mass is: Electron < Proton < Hydrogen Atom < Alpha Particle.

4. **Select the Correct Option**:
- Based on the increasing order of mass, the correct sequence is:
- **Electron < Proton < Hydrogen Atom < Alpha Particle**.
- This corresponds to option **B**: Electron, Proton, Hydrogen Atom, Alpha Particle.

### Final Answer:
The correct sequence in terms of increasing mass is **B: Electron, Proton, Hydrogen Atom, Alpha Particle**.