Atomic Models

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

• 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

Ernest Rutherford discovered that atoms were mostly _________________. 

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

In the gold foil experiment, most of the positively charged alpha particles passed through the gold foil, but some were deflected or bounced back.  What did we conclude because of this?  

• Atoms are small indivisible spheres
• Atoms are mostly empty space with a small, dense, positive center
• Atoms have negatively charged particles which orbit the nucleus
• Light is a wave, not a particle

What are electrons?

• an atom’s central regions, which is made up of protons and neutrons

• subatomic particles that have negative charges

• subatomic particles that have neutral charges

• subatomic particles that have positive charges

According to the modern concept of the atom, which are located in the nucleus of an atom?

• electrons and protons

• protons only

• neutrons and electrons

• protons and neutrons

Tags

NGSS.HS-PS1-8

A ____________________ is a subatomic particle that has mass nearly equal to that of a proton, but it carries no electrical charge.

• proton

• neutron

• electron

This is the most complete and current model of the atom. Electrons are located in complex orbitals.

• The "Quantum Mechanical Model" of the atom

• The "Rutherford Model" of the atom

• The "Plum Pudding Model" of the atom

• The "Bohr 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 "Plumb Pudding Model" of the atom
• The "Quantum Mechanical Model" of the atom

Tags

NGSS.MS-PS1-1

In the Bohr Model, how many electrons fit in the first energy level?

• 2
• 4
• 8
• 18

In the Bohr Model, how many electrons fit in the second energy level?

• 2
• 4
• 8
• 18