Ch. 10 - Atomic Structure
II. Electron Cloud Model
Bohr Model Diagrams
Region where there is 90% probability of finding an electron.
Canít pinpoint the location of an electron.
Density of dots represents degree of probability.
Orbitals have different shapes.
Electrons can only exist at certain energy levels.
Low energy levels are close to the nucleus.
Each energy level (n) can hold 2n2 electrons.
Simplified energy levels using Bohrís idea of circular orbits.
Level 1 2e-
Level 2 8e-
Level 3 18e-
Level 4 32e-
Atomic #: 3
# of p: 3
# of e: 3
# of n: 4
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 Ďpí and Ďní in the nucleus.
Have a partner check your drawing.
Repeat with a new element.