Light & Quantized Energy

Questions about the Atom

Objectives:Learn about the way light acts

Define a Quantum of Energy

Understand the Electromagnetic spectrum

How was Rutherford’s atomic model arranged?

Rutherford’s model All of an atoms positive charge

located in the center of the atom

Almost all the mass was located at the center of the atom

J.J. Thompson’s Model

Rutherford’s Model

What was missing from Rutherford’s model?

Unanswered Questions (Atom)Did not explain how the atoms

electrons were arranged around the nucleus

Did not explain why the negative electrons were not pulled into the positive protons

Unanswered Questions (Continued)

Rutherford’s model could not explain chemical behavior among the elements.

How did scientist discover information about chemical behavior?

Scientists found out that chemical behavior was related to the arrangement of the electrons in an atom.

Scientists observed that certain elements emitted visible light when heated in a flame.

How does light behave? Light has both characteristics of a particle

and a wave.

What is electromagnetic radiation?

A form of energy that exhibits wave like behavior as it travels through space.

What are the Characteristics of Waves? Wavelength

Frequency

Amplitude

C=page 137