The Atom Review
Presentation
•
Chemistry
•
9th - 12th Grade
•
Hard
Standards-aligned
Lauren Wells
Used 8+ times
FREE Resource
11 Slides • 18 Questions
1
The Atom
Review
2
Battle of the Greeks
Aristotle: Continuous Theory
-Matter can be divided infinitely
Democritus & Leucippus: Discontinuous Theory
- There is a tiny indivisible particle called an atom
3
Dalton's Atomic Theory
1. Elements are made of atoms
2. Atoms of an element are the same.
3. Compounds are formed from combinations of atoms
4
JJ Thomson: Plum Pudding Model
Discovered the electrons while performing experiments with cathode rays
5
Ernest Rutherford: Nuclear Model
Performed Gold Foil Experiment
- Proved the atom was mostly empty space
- Discovered the dense, tiny, positive nucleus
6
Niel's Bohr: Planetary Model
Proposed e- traveled in fixed paths around the nucleus.
Each level can hold a maximum # of e-
Energy Level = Shell
7
Modern Atomic Model
AKA Wave-Mechanical or Electron Cloud
e- behave like waves and particles
Orbitals = most probable location of an e-
Electrons don't orbit the nucleus
8
Multiple Choice
9
Multiple Choice
10
Multiple Choice
Number 1 is _ while number 2 is _.
11
Multiple Choice
12
Excited vs Ground State
Electrons jump to higher energy level when energy is absorbed
Electrons return to original ground state energy level when energy is released as light
Emission spectra used to identify elements (fingerprint)
Number of electrons doesn't change
13
Multiple Choice
14
Multiple Choice
15
Multiple Choice
16
Multiple Choice
17
Using the Periodic Table
# p+ = 8
# e- = 8
# n0 = 16 - 8 = 8
18
Multiple Choice
19
Multiple Select
The letter “X” in the diagram marks the:
select all that apply
20
Multiple Select
21
Multiple Choice
22
Isotopes
Same number of protons & electrons (atomic #)
Different number of neutrons (mass number)
23
Multiple Choice
If we assume pink represents protons and green represents neutrons, the nucleus depicted here is:
24
Multiple Select
25
Multiple Choice
26
Multiple Choice
27
Weighted Atomic Mass
Atomic mass = average of naturally occurring isotopes
Atomic mass will be closer to the most abundant isotope
28
Multiple Choice
29
Fill in the Blanks
The Atom
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