Development of Atomic Models

In the atomic model nicknamed the "plum pudding" model, what do the plums represent?

• the nucleus

• the atom

• the electrons

• the positive material

Which scientist proposed a new atomic model after discovering the electron in 1897?

• Dalton

• Thomson

• Rutherford

• Bohr

Who discovered that atoms are mostly empty space?

• Dalton

• Thomson

• Rutherford

• Bohr

Who proposed that electrons move around the nucleus in circular orbits?

• Dalton

• Thomson

• Rutherford

• Bohr

This model this model was the first to show a nucleus, consisting of protons and neutron.  Electrons surround the nucleus but are not shown in distinct energy levels. 

• The "Rutherford Model" of the atom
• The "Plum Pudding Model" of the atom
• The "Quantum Mechanical Modell" of the atom
• Democritus's model of the atom

Tags

NGSS.HS-PS1-8

This was the first model of the atom ever proposed. It was simple and described atoms as tiny spheres that could not be broken down into smaller pieces.

• Democritus's model of the atom
• The "Plum Pudding Model" of the atom
• The "Rutherford Model" of the atom
• The "Quantum Mechanical Model" of the atom

This model added on to previous models by showing electrons existed at certain "energy levels". However it does not accurately show what those levels look like.

• The "Bohr Model" of the atom

• The "Rutherford Model" of the atom

• The "Plum Pudding Model" of the atom

• The "Quantum Mechanical Model" of the atom

Tags

NGSS.HS-PS1-1

This model was developed after J.J. Thompson discovered electrons, a particle smaller than an atom. Is shows electrons floating freely in a positive space.

• The "Plum Pudding Model" of the atom
• The "Rutherford Model" of the atom
• Democritus's model of the atom
• The "Quantum Mechanical Model" of the atom

What does the nucleus of an atom contain?

• Electrons & Neutrons
• Protons & Neutrons
• Neutrinos & Positrons

Tags

NGSS.HS-PS1-8

Ernest Rutherford discovered that atoms were mostly _________________. 

• negatively charged
• positively charged
• electrons
• empty space.