Download Parts of an atom lesson

Chapter 1.3
Atomic theory and the atom
Heisenberg uncertainty principle
• https://www.youtube.com/watch?v=TQKELOE
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(c) McGraw Hill Ryerson 2007
Answer these questions in a group
1. Bohr’s “planetary model” states that
electrons are in specific energy levels or
“orbits” around the nucleus. Explain how
this is not possible using Heisenberg’s
uncertainty principle.
2. Explain what might have been Thomson’s
thought process when he discovered the
electron and used his discovery to come up
with his ‘chocolate chip cookie’ model of the
atom.
3. Compare and contrast Dalton’s model,
Thomson’s model, Rutherford’s model, and
Bohr’s model of the atom.
What makes up an Atom?
• An atom is the smallest part of an element.
• An atom is made up of subatomic particles.
• http://ed.ted.com/lessons/the-uncertainlocation-of-electrons-george-zaidan-andcharles-morton
• http://ed.ted.com/lessons/just-how-small-isan-atom
Standard model of the Atom
• Matter is composed of atoms
• Atoms are made of three basic particles:
1. Protons – Positive particles in the Nucleus.
2. Neutrons – Neutral particles in the Nucleus.
3. Electrons – Negative particles in region around
nucleus.
N
P
Neutron
(neutral)
Proton
(positive)
Electron
(negative)
In Nucleus
In Layers
Atoms
• Notice:
• Atoms can be neutral with equal protons and
electrons.
• When atoms lose electrons the matter becomes
charged +
• When atoms gain electrons the matter becomes
charged –
• ***Important:****
• ****Only the electrons are able to move to or
from an atom…*****
Atomic and Mass Number
• Atoms of the same element have the same
number of protons.
– This is also called the atomic number
• Atoms of different elements have different
numbers of protons
• The mass number is the number of protons
and neutrons
• Mass number = # of neutrons + # of protons
Modern model of the atom
• The modern model includes quarks
– Protons and neutrons are made of quarks
– Electrons are made of leptons
http://www.thestargarden.co.uk/Strong-nuclear-force.html
Quarks and leptons
• https://www.youtube.com/watch?v=SMgi2j9K
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• Read and take notes from section 4.2 of
enrichment book
• Bill nye video
• Next day particle adventure
Particle adventure-Assignment
• http://www.particleadventure.org/
– Lab handout
– In the lab