J.J. Thomson discovered the electron using

• gold foil and alpha particles.

• oil drops.

• a cathode ray tube.

• emission spectra of a hydrogen atom.

Niels Bohr added _______________ to the model of the atom.

• electrons.

• a nucleus.

• neutrons.

• energy levels.

J.J. Thomson discovered electrons, and he also knew that atoms are neutral. From these two facts, Thomson inferred that the atom also contains

• positive material.

• a nucleus.

• neutrons.

• energy levels.

Which of the following is the best description of J.J. Thomson's model of the atom?

• a featureless, indivisible sphere

• a sphere of positive material with electrons embedded in it

• mostly empty space with electrons randomly orbiting around a positive nucleus

• mostly empty space with electrons located in set orbits around a positive nucleus.

What element is represented in this Bohr Model?

• Boron
• Carbon
• Nitrogen
• Lithium

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What element is represented in this Bohr Model?

• Lithium
• Boron
• Carbon
• Neon

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What element is represented in this Bohr Model?

• Beryllium
• Boron
• Barium
• Bromine

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In an atom, what is the number of protons equal to?

• The number of electrons.
• The number of neutrons.
• The number of molecules.
• The number of nuclei.

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NGSS.MS-PS1-1

The negatively charged particles of an atom are the ______.

• electrons
• protons
• neutrons
• protons & neutrons

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What does the nucleus of an atom contain?

• Electrons and neutrons
• Protons and neutrons
• Neutrinos and positrons
• DNA and RN

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