Answer :
1. John Dalton was an English scientist who is known for his work in the development of modern atomic theory. He was a chemist and physicist who lived in the late 18th and early 19th centuries.
2. Dalton used the following evidence to argue for the existence of atoms:
- His observations of chemical reactions showed that elements combined in specific ratios by mass to form compounds.
- He also studied the behavior of gases under different pressures and temperatures, which led him to propose the concept of the atom.
3. Dalton's atomic theory consists of the following key points:
- All matter is made up of tiny, indivisible particles called atoms.
- Atoms of the same element are identical in size, mass, and properties.
- Atoms of different elements have different sizes, masses, and properties.
- Atoms combine in simple whole-number ratios to form compounds.
- Chemical reactions involve the rearrangement of atoms; atoms are neither created nor destroyed in a chemical reaction.
4. Dalton modeled atoms as tiny, indivisible spheres. He represented different elements by using different types of atoms, each with specific properties. When it came to compounds, Dalton viewed them as combinations of atoms of different elements in fixed ratios. This simplistic model helped illustrate how elements combine to form compounds according to his atomic theory.
2. Dalton used the following evidence to argue for the existence of atoms:
- His observations of chemical reactions showed that elements combined in specific ratios by mass to form compounds.
- He also studied the behavior of gases under different pressures and temperatures, which led him to propose the concept of the atom.
3. Dalton's atomic theory consists of the following key points:
- All matter is made up of tiny, indivisible particles called atoms.
- Atoms of the same element are identical in size, mass, and properties.
- Atoms of different elements have different sizes, masses, and properties.
- Atoms combine in simple whole-number ratios to form compounds.
- Chemical reactions involve the rearrangement of atoms; atoms are neither created nor destroyed in a chemical reaction.
4. Dalton modeled atoms as tiny, indivisible spheres. He represented different elements by using different types of atoms, each with specific properties. When it came to compounds, Dalton viewed them as combinations of atoms of different elements in fixed ratios. This simplistic model helped illustrate how elements combine to form compounds according to his atomic theory.
