What did Democritus propose about the composition of matter?

Matter is composed of tiny, indivisible particles called "atomos" surrounded by empty space.

Matter is made of four elements: Earth, Wind, Water, and Fire.

Atoms are uniformly packed spheres of positive matter filled with negatively charged electrons.

Electrons orbit the nucleus at fixed energies and distances.

What was a key aspect of John Dalton's atomic theory?

He demonstrated that common substances always broke down into the same elements in the same proportions, suggesting compounds are combinations of atoms.

He proposed that matter is made of four fundamental elements.

He discovered that atoms contain negatively charged electrons.

He concluded that electrons orbit the nucleus in fixed energy levels.

What did Ernest Rutherford's gold foil experiment reveal about the atom?

Atoms consist largely of empty space with a dense, positively charged nucleus.

Atoms are uniformly packed spheres of positive matter.

Electrons orbit the nucleus in fixed energy levels.

Electrons behave simultaneously as both particles and waves.

Which of the following statements are true about Rutherford's model of the atom?

It introduced the concept of a nucleus.

Electrons orbit around a central nucleus.

The atom is mostly empty space.

Atoms are solid and indestructible.

Which of the following statements about subatomic particles are correct?

Protons have a positive charge.

Neutrons have a neutral charge.

Electrons have a negative charge.

Protons are found in the electron cloud.

Which of the following statements about neutrons are correct?

They have a mass of 1 atomic mass unit.

They determine the identity of the element.

What are the main differences between protons, neutrons, and electrons in terms of their properties and location within an atom?

Protons are positively charged and found in the nucleus, neutrons have no charge and are also in the nucleus, electrons are negatively charged and orbit the nucleus.

Protons are negatively charged and found outside the nucleus, neutrons are positively charged and found in the nucleus, electrons have no charge and are in the nucleus.

Protons and electrons are both found in the nucleus, neutrons orbit the nucleus.

All three particles are found outside the nucleus and have the same charge.

Atomic Structure & The Pt

Atomic Structure & the PT

Interactive Video

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Science

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12th Grade

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Practice Problem

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Hard

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NGSS

MS-PS1-1, HS-PS1-3

Standards-aligned

Tammy Campbell

FREE Resource

111 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

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

Protons, neutrons, electrons

Protons, electrons, photons

Neutrons, electrons, positrons

Protons, neutrons, quarks

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