Atomic Models- Spring 2021

Atomic Structure

3 minutes: Notice & Wonder Observe & Infer

Open Ended

3 Minutes: What do you think chemistry is?

General Chemistry

The foundation of Chemistry

Atomic Models

Atomic Models

• A visual representation of the structure of an atom, (how an atom looks and made-up of)

• Nucleus

• Inside Nucleus: Protons (positive charge) and Neutrons (no charge)

• Outside Nucleus: Electrons (negative charge)

Plum Pudding Model

• J.J. Thomson

• J.J. Thomson discovered the electron!

• States that atoms mostly consist of positively charged material with negatively charged particles (electrons) located throughout the positive material

Gold Foil Experiment/ Planetary Model

• Ernest Rutherford

• Discovered Atoms have a Nucleus that contains most of the mass of the atom!

• Discovered nucleus is made up of particles called protons, which have a positive charge

• The protons are surrounded by negatively charged electrons, but most of the atom is actually empty space

Bohrs Model

• Niels Bohr

• Proposed electrons travel around the nucleus of an atom in orbits or definite paths.

• the electrons can jump from a path in one level to a path in another level (depending on their energy

Quantum Mechanics & Electrons Clouds

• James Chadwick discovered the neutrons!

• Electrons are in Electron Clouds

• Electrons are not easily located, but most likely to be found in an electron cloud!

What do I need to Know?

• An atom is made up of a nucleus and 3 subatomic particles: protons, neutrons, electrons

• The nucleus contains most of an atom's mass!

• Inside Nucleus: Protons (positive charge) and Neutrons (neutral/no charge)

• Outside Nucleus: Electrons (negative charge) sit in electron clouds!

Multiple Choice

Which option below describes the structure of an atom?

• Inside Nucleus: Protons and Electrons

  Outside Nucleus: Neutrons

• Inside Nucleus: Neutrons and Electrons

  Outside Nucleus: Protons

• Inside Nucleus: Protons and Neutrons

  Outside Nucleus: Electrons

• Inside Nucleus: Protons

  Outside Nucleus: Neutrons and Electrons

Multiple Choice

What is the charge of a Proton?

• Negative (-)

• Positive (+)

• Neutral (0)

Multiple Choice

What is the charge of an Electron?

• Negative (-)

• Positive (+)

• Neutral (0)

Multiple Choice

What is the charge of an Neutron?

• Negative (-)

• Positive (+)

• Neutral (0)