Introduction to Atoms

______ is the smallest particle of an element.

• element

• molecule

• atom

• compound

Describe atomic theory.

Answer explanation

Atomic theory grew as a series of models that developed from experimental evidence. As more evidence was collected, the theory and models were revised.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

Give one example from the summary of Dalton's Ideas.

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NGSS.MS-PS1-1

NGSS.MS-PS1-5

The negatively charged particles in an atom are called

Illustrate Thomson's Model

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NGSS.MS-PS1-1

Who inferred that an atom's positive charge is clustered in the nucleus?

• Dalton

• Rutherford

• Thomson

• Bohr

Tags

NGSS.HS-PS1-8

Electrons have almost no mass

• true

• false

Tags

NGSS.HS-PS1-7

Nearly all of an atom's mass is located in the _______.

The positively charged particles in the nucleus of an atom are called

• electrons

• neutrons

• protons

Illustrate Rutherford's' Model

Tags

NGSS.MS-PS1-1