Atomic Theory and Atomic Structure

Order the atomic models below from the oldest to the most recent.

• 2, 1, 3, and 4

• 1, 2, 4, and 3

• 3, 2, 4, and 1

• 3, 1, 2, and 4

Which scientist proposed a model of the atom in which the individual atoms were thought of as tiny solids like balls or marbles?

• John Dalton

• James Chadwick

• Ernest Rutherford

• J.J. Thomson

One of the Dalton's conclusions concerning his atomic theory was that all the atoms of the same element are ___.

• the same

• different

• combined

• reacted

Tags

NGSS.MS-PS1-1

Which atomic model has a positively charged nucleus and a negatively charged cloud of electrons giving the atom its size?

• Modern Theory Model

• Plum-pudding Model

• Planetary Model

• Marble Model

Which of the following correctly describes the electron cloud model?

• Electrons do not follow fixed orbits, but are found more frequently in areas around the nucleus.

• Electrons are found in fixed orbitals around a positive nucleus.

• All of an atom's mass is concentrated in the electron cloud around the nucleus.

• Electrons are evenly embedded throughout a positively charged sphere.

According to modern atomic theory, electrons are found ___.

• occupying unspecified regions around the nucleus, based on how much energy each electron has

• in totally random and varying orbits around the nucleus

• in fixed orbits at well-defined distances from the nucleus

• closely attached to the nucleus

Whose model of an atom is displayed in the picture?

• Thomson

• Rutherford

• Dalton

• Bohr

Whose model of an atom is displayed in the figure?

• Bohr

• Rutherford

• Thomson

• Modern Model

Tags

NGSS.MS-PS1-1

Which of the following correctly orders the atomic models from the oldest to the most recent?

• Dalton, Thomson, Rutherford, Bohr, Electron Cloud

• Dalton, Thomson, Bohr, Electron Cloud, Rutherford

• Thomson, Dalton, Rutherford, Electron Cloud, Bohr

• Electron Cloud, Bohr, Rutherford, Thomson, Dalton

The atomic mass number consists of

• the total number of electrons and protons

• the total number of protons and neutrons

• the number of protons

• the total number of electrons and neutrons