Atomic Structure

1
Atomic Structure

• II. Electron Cloud Model
• Orbital
• Energy Levels
• Bohr Model Diagrams

2
A. Orbital

• Region where there is 90 probability of finding
  an electron.

• Cant pinpoint the location of an electron.
• Density of dots represents degree of probability.

3
A. Orbital

• Orbitals have different shapes.

4
B. Energy Levels

• Electrons can only exist at certain energy
  levels.
• Low energy levels are close to the nucleus.
• Each energy level (n) can hold 2n2 electrons.

5
C. Bohr Model Diagrams

• Simplified energy levels using Bohrs idea of
  circular orbits.

Lithium Atomic 3 Mass 7 of
p 3 of e 3 of n 4
e-
e-
Maximum e- Level 1 2e- Level 2 8e- Level
3 18e- Level 4 32e-
e-
6
C. Bohr Model Activity

• Choose a number between 1 18.
• Find your element by the atomic number you
  picked.
• Draw a Bohr Model diagram for your element on
  your marker board.
• Round off the mass listed on the table and
  subtract the atomic to find the of neutrons.
• Abbreviate the of p and n in the nucleus.
• Have a partner check your drawing.
• Repeat with a new element.