History of Atomic Theory

Discovered the neutron

• Ernest Rutherford

• James Chadwick

• J.J. Thomson

• John Dalton

Which scientist saw the atom as a positively charged sphere with negative particles (electrons) embedded within?

• J.J. Thomson
• Niels Bohr
• John Dalton
• Ernest Rutherford

Which scientist proposed a model of the atom in which the electrons are orbiting at different levels?

• Niels Bohr
• James Chadwick
• John Dalton
• Ernest Rutherford

Which scientist used his gold foil experiment to show that an atom has a small, central, positively charged nucleus that contains most of the atom's mass?

• Rutherford
• Bohr
• Thomson
• Dalton

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Whose model of an atom is displayed in the picture?

• Thomson
• Rutherford
• Dalton
• Bohr

Protons are located in the nucleus of the atom. A proton has

• No charge

• A negative charge

• A positive and a negative charge

• A positive charge

Neutrons are in the nucleus of the atom. A neutron has

• A positive charge

• No charge

• A negative charge

• Twice as much positive charge as a proton

The periodic table shows that a carbon atom has six protons. This means that a carbon atom also has

• Six electrons

• Six neutrons

• More protons than electrons

• An atomic mass that equals six

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Electrons are found in the nucleus of an atom.

• True

• False

Neutrons and electrons are attracted to one another.

• True

• False