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Questions and Answers
Which subatomic particles were discovered towards the end of the nineteenth century?
Which subatomic particles were discovered towards the end of the nineteenth century?
- Neutrons, positrons, and photons
- Electrons, protons, and neutrons (correct)
- Elephants, giraffes, and lions
- Atoms, molecules, and compounds
What did Dalton's atomic theory propose about the atom?
What did Dalton's atomic theory propose about the atom?
- It is the smallest indivisible constituent of all matter. (correct)
- It is made up of electrons, protons, and neutrons.
- It can explain the law of conservation of energy.
- It discovered the law of multiple proportions.
What is the charge of electrons?
What is the charge of electrons?
- Positive
- Variable
- Negative (correct)
- Neutral
Which particle is uncharged in nature?
Which particle is uncharged in nature?
What did experiments towards the end of the nineteenth century show about Dalton's atom?
What did experiments towards the end of the nineteenth century show about Dalton's atom?
What did Dalton's atomic theory propose regarding the atom's divisibility?
What did Dalton's atomic theory propose regarding the atom's divisibility?
Which subatomic particles were discovered towards the end of the nineteenth century?
Which subatomic particles were discovered towards the end of the nineteenth century?
What are the charges of electrons, protons, and neutrons, respectively?
What are the charges of electrons, protons, and neutrons, respectively?
How did experiments in the nineteenth century challenge Dalton's atomic theory?
How did experiments in the nineteenth century challenge Dalton's atomic theory?
Why is it said that an atom is not the smallest indivisible particle of matter according to the text?
Why is it said that an atom is not the smallest indivisible particle of matter according to the text?
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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.
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