10 Questions
Which subatomic particles were discovered towards the end of the nineteenth century?
Electrons, protons, and neutrons
What did Dalton's atomic theory propose about the atom?
It is the smallest indivisible constituent of all matter.
What is the charge of electrons?
Negative
Which particle is uncharged in nature?
Neutrons
What did experiments towards the end of the nineteenth century show about Dalton's atom?
It is made up of even smaller particles.
What did Dalton's atomic theory propose regarding the atom's divisibility?
The atom is indivisible and the smallest constituent of matter.
Which subatomic particles were discovered towards the end of the nineteenth century?
Electrons, protons, and neutrons
What are the charges of electrons, protons, and neutrons, respectively?
Negative, positive, negative
How did experiments in the nineteenth century challenge Dalton's atomic theory?
By proving that atoms can be divided into smaller particles.
Why is it said that an atom is not the smallest indivisible particle of matter according to the text?
Because atoms are divisible into electrons, protons, and neutrons.
Study Notes
Subatomic Particles and Dalton's Atomic Theory
- Towards the end of the 19th century, electrons, protons, and neutrons were discovered as subatomic particles.
Dalton's Atomic Theory
- Proposed that atoms are indivisible and cannot be created or destroyed.
- Implied that atoms are the smallest units of matter.
Charges of Subatomic Particles
- Electrons have a negative charge.
- Protons have a positive charge.
- Neutrons are uncharged in nature.
Challenges to Dalton's Atomic Theory
- Experiments towards the end of the 19th century showed that atoms are not indivisible and can be broken down into smaller subatomic particles.
- Challenged Dalton's proposal that atoms are indivisible and cannot be broken down further.
Limitations of Dalton's Atomic Theory
- Atoms are not the smallest indivisible particles of matter, as they can be broken down into subatomic particles like electrons, protons, and neutrons.
Test your knowledge on Dalton's atomic theory, which proposed in 1803 that atoms are the smallest indivisible constituents of all matter. Learn about the laws of conservation of mass, constant composition, and multiple proportions. Discover how experiments towards the end of the nineteenth century challenged Dalton's theory regarding the indivisibility of the atom.
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