Atomic theory was given by

Options

A. John Dalton
B. Neils Bohr
C. E. Rutherford
D. Haber Bosch

Explanation

**Step-by-Step Solution:**

1. **Identify the Question**: The question asks who proposed the atomic theory.

2. **Recall the Scientist**: The atomic theory was proposed by John Dalton.

3. **Understand Dalton's Postulates**:
- **First Postulate**: All matter is composed of atoms, which are the fundamental building blocks of matter.
- **Second Postulate**: All atoms of a given element are identical in mass and properties.
- **Third Postulate**: Atoms of different elements differ in size and mass.
- **Fourth Postulate**: Compounds are formed when atoms of different elements combine in fixed whole-number ratios.

4. **Conclusion**: Therefore, the answer to the question is that atomic theory was given by John Dalton.

**Final Answer**: Atomic theory was given by John Dalton.

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