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Dalton Atomic Theory & Thompson Model - Chemistry Structure of Atom, Force & Laws of Motion, Science, Class 9 Video Lecture

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FAQs on Dalton Atomic Theory & Thompson Model - Chemistry Structure of Atom, Force & Laws of Motion, Science, Class 9 Video Lecture

1. What is Dalton's atomic theory and how does it relate to the structure of an atom?
Ans. Dalton's atomic theory, proposed by John Dalton in the early 19th century, states that atoms are indivisible and indestructible particles that make up all matter. According to this theory, atoms of different elements combine in fixed ratios to form compounds, and chemical reactions involve the rearrangement of atoms. This theory laid the foundation for our understanding of the structure of an atom and the concept of atomic mass.
2. How does the Thompson model of the atom differ from Dalton's atomic theory?
Ans. The Thompson model, proposed by J.J. Thompson in the late 19th century, introduced the idea that atoms are not indivisible but are composed of smaller subatomic particles called electrons. Thompson's model suggested that electrons were embedded in a positively charged "pudding-like" substance, known as the plum pudding model. This model differed from Dalton's atomic theory by acknowledging the presence of subatomic particles within the atom.
3. What is the significance of the force and laws of motion in understanding the structure of an atom?
Ans. The force and laws of motion play a crucial role in understanding the structure of an atom. According to Newton's laws of motion, electrons move in specific orbits or energy levels around the nucleus of an atom. The electrostatic force of attraction between the negatively charged electrons and the positively charged nucleus keeps the electrons in their orbits. Understanding the forces acting on the electrons and the motion of these particles helps us comprehend the stability and arrangement of atoms.
4. How do Dalton's atomic theory and the Thompson model contribute to modern atomic theory?
Ans. Dalton's atomic theory and the Thompson model were significant contributions to modern atomic theory. Dalton's theory laid the foundation for the concept of atoms as the fundamental building blocks of matter and the understanding of chemical reactions. Thompson's model, on the other hand, introduced the idea of subatomic particles and helped refine our understanding of the atom's structure. These theories paved the way for further advancements, such as Rutherford's nuclear model and the Bohr model, leading to our current understanding of the atom.
5. What are the key differences between Dalton's atomic theory and the Thompson model in terms of their explanations for the structure of an atom?
Ans. The key differences between Dalton's atomic theory and the Thompson model lie in their explanations for the structure of an atom. Dalton's theory proposed that atoms were indivisible and had no subatomic particles, while the Thompson model introduced the concept of electrons as subatomic particles. Dalton's theory focused on the idea of fixed ratios in compound formation, whereas the Thompson model emphasized the existence of a positively charged nucleus and negatively charged electrons within the atom. These contrasting explanations highlight the progression in our understanding of atomic structure over time.
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