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Physics /Atomic Theory and Discoveries

Atomic Theory and Discoveries

Physics10 CardsCreated about 2 months ago

This deck covers the historical development of atomic theory, including Dalton's contributions, the discovery of subatomic particles, and the techniques used to observe atoms.

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What assumption did Dalton make to account for the laws of constant composition and multiple proportions?

Dalton assumed the existence of atoms.

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Key Terms

Term

Definition

What assumption did Dalton make to account for the laws of constant composition and multiple proportions?

Dalton assumed the existence of atoms.

What technique allows us to obtain images of individual atoms?

Scanning tunneling microscopy.

What do the gold spheres in the scanning tunneling microscopy images represent?

Each gold sphere represents a silicon atom.

What was Dalton's limitation in proving the existence of atoms?

Neither Dalton nor his contemporaries had direct evidence for the existence of atoms.

What are atoms composed of according to modern understanding?

Atoms are composed of subatomic particles.

What charge interactions exist between particles in an atom?

Particles with the same charge repel each other, while particles with opposite charges attract each other.

What did the discovery of subatomic particles reveal about the atom?

It revealed that the atom has a more complex structure than previously thought.

What are the two types of charges found in subatomic particles?

Positive and negative charges.

What was a key limitation of Dalton's atomic theory?

Lack of direct evidence for atoms at the time.

What is the significance of the nuclear model of the atom?

It describes the atom as having a dense, positively charged nucleus.

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Atomic Theory and Discoveries

Term	Definition
What assumption did Dalton make to account for the laws of constant composition and multiple proportions?	Dalton assumed the existence of atoms.
What technique allows us to obtain images of individual atoms?	Scanning tunneling microscopy.
What do the gold spheres in the scanning tunneling microscopy images represent?	Each gold sphere represents a silicon atom.
What was Dalton's limitation in proving the existence of atoms?	Neither Dalton nor his contemporaries had direct evidence for the existence of atoms.
What are atoms composed of according to modern understanding?	Atoms are composed of subatomic particles.
What charge interactions exist between particles in an atom?	Particles with the same charge repel each other, while particles with opposite charges attract each other.
What did the discovery of subatomic particles reveal about the atom?	It revealed that the atom has a more complex structure than previously thought.
What are the two types of charges found in subatomic particles?	Positive and negative charges.
What was a key limitation of Dalton's atomic theory?	Lack of direct evidence for atoms at the time.
What is the significance of the nuclear model of the atom?	It describes the atom as having a dense, positively charged nucleus.