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Dalton's Atomic Theory Quiz

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Questions and Answers

According to Dalton's atomic theory, what was considered the smallest indivisible constituent of all matter?

atom

What are the three subatomic particles that make up an atom?

electrons, protons, neutrons

What are the charges of electrons, protons, and neutrons?

electrons - negatively charged, protons - positively charged, neutrons - uncharged

Which laws could Dalton's atomic theory explain?

law of conservation of mass, law of constant composition, law of multiple proportions Signup and view all the answers

What did experiments towards the end of the nineteenth century reveal about Dalton's atomic theory?

An atom is not the smallest or indivisible particle of matter as stated by Dalton; it is made up of even smaller particles. Signup and view all the answers

What did Dalton's atomic theory propose about the nature of the atom?

Dalton's atomic theory proposed that the atom is the smallest indivisible constituent of all matter. Signup and view all the answers

What were the three laws that Dalton's theory could explain?

Dalton's theory could explain the law of conservation of mass, law of constant composition, and law of multiple proportions. Signup and view all the answers

What were the smaller particles that experiments towards the end of the nineteenth century revealed the atom to be composed of?

Experiments revealed that the atom is composed of smaller particles called electrons, protons, and neutrons. Signup and view all the answers

What are the charges of electrons, protons, and neutrons?

Electrons are negatively charged, protons are positively charged, and neutrons are uncharged in nature. Signup and view all the answers

How did the discoveries towards the end of the nineteenth century challenge Dalton's atomic theory?

The discoveries showed that an atom is not the smallest or indivisible particle of matter as stated by Dalton, and that it is made up of even smaller particles. Signup and view all the answers

Study Notes

Dalton's Atomic Theory

Proposed in 1803, asserting that atoms are the smallest indivisible constituents of matter.
Explained three fundamental laws:
- Law of Conservation of Mass - Mass is neither created nor destroyed in chemical reactions.
- Law of Constant Composition - A given compound always contains the same proportion of elements by mass.
- Law of Multiple Proportions - Different compounds can be formed from the same elements in different ratios.

Advancements in Atomic Understanding

End of the 19th century saw experiments that challenged Dalton’s assertions.
Discovery of subatomic particles revealed that atoms are not the smallest units of matter.
Atoms consist of smaller particles: electrons, protons, and neutrons.

Subatomic Particles

Electrons:
- Negatively charged.
- Involved in chemical bonding and reactions.
Protons:
- Positively charged.
- Present in the nucleus and determine the atomic number.
Neutrons:
- Have no charge (neutral).
- Also found in the nucleus, contributing to atomic mass.

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Description

Test your knowledge of Dalton's atomic theory and its limitations with this quiz! Explore the historical context and the experimental evidence that led to the development of modern atomic theory.