ATOMIC THEORY

Explain how the Rutherford gold foil experiment correctly advanced atomic theory away from the plum pudding mode

• it proved the atom contained positive AND negative charges.

• It proved the positive charge is concentrated in a relatively small region of the atom.

• It proved the atom contains protons, electrons, and neutrons.

• It proved that atoms are spherical in shape and not shaped like pudding

J. J. Thomson's model of the atom includes all BUT ONE of these features. That is

• electrons revolved around the positive nuclear sphere.

• the positive atomic charge is spherically distributed.

• electrons radiated throughout the positive sphere.

• an atom contains both positive and negative charges.

Sir J.J. Thompson discovered the electron in 1897. How did Thompson explain the overall neutral charge of the atom?

• Electrons are present all over the atom, even in the nucleus.

• Electrons alternate between positive and negative charges.

• Negative electrons were inside a cloud of positive charge.

• Electrons travel around the nucleus at great speeds.

In the famous gold foil experiment, radioactive particles were fired at a very thin sheet of gold foil. Most of the particles passed straight through the gold foil. Only about 1 in every 8000 particles were deflected. The gold foil experiment showed the researchers that the atom is made mostly of

• protons

• electrons

• neutrons

• empty space

Tags

NGSS.HS-PS1-8

The nucleus of an atom contains which subatomic particles?

• protons and neutrons

• protons and electrons

• neutrons only

• neutrons and electrons

Tags

NGSS.HS-PS1-8

The model of the atom where the central core contains protons and neutrons surrounded by a cloud of electrons is best described as

• The Bohr model of the atom.

• The modern model of the atom.

• The plum pudding model of the atom.

• The solar system model of the atom.