Download Atoms ppt 8/26/16

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TOC 8/26/16:
Atoms
Essential Questions:
1. What is the basic structure of
atoms?
2. How is an atom’s mass
calculated?
3. Which subatomic particles are
electrically charged?
.
Essential Questions:
4. Where are the three main
subatomic particles located?
5. How do protons determine an
atom’s identity?
INPUT (Right Side)
Atoms
What is an atom?
• The basic building blocks of
ordinary matter
• The basic unit of a chemical
element. (ex: gold, oxygen,
mercury)
• Consists of 3 basic parts - protons,
neutrons, electrons (also called
subatomic particles)
© KeslerScience.com
Atoms
Structure of an Atom
• Consists of a nucleus in the
center containing protons
and neutrons.
• The electron cloud
surrounds the nucleus and
contains the electrons. The
rings are referred to as
orbitals or shells.
© KeslerScience.com
E
P
N
Atoms
Protons
• Positively charged subatomic
particle
• Located inside the nucleus
• Included in the atom’s mass.
• 1 proton = 1atomic mass unit
(amu)
• Atomic Number = # of protons
• Determines the element’s
identity
© KeslerScience.com
Atoms
Neutrons
• No electrical charge
• Located inside the nucleus
• Included in the atom’s
mass
• 1 neutron = 1atomic mass
unit (amu)
• May not always be the
same as the number of
protons.
© KeslerScience.com
Atoms
Electrons
• Negatively charged subatomic
particle
• Located outside the nucleus.
• Does not contribute to the
atom’s mass.
• 1 Electron = 1/2000 atomic mass
unit (amu)
• In a neutral atom the number of
protons and electrons are
equal.
© KeslerScience.com
OUTPUT (Left Side)
©
KeslerScience.com