Download atoms lesson

What is everything on the planet
made out of?
All things on earth are made of
ATOMS!
OBJECTIVES
• Know the three parts of an ATOM: the
ELECTRON, PROTON, and NEUTRON.
• Explain what makes ATOMS of one ELEMENT
different from those of another ELEMENT.
• Be able to calculate ATOMIC MASS and
ATOMIC NUMBER.
All things on earth are made of ATOMS!
• ATOM = smallest working unit of matter
• The ATOM is so small that it cannot be seen,
even when using a microscope at school.
• How do we know that atoms exist???
MYSTERIOUS ENERGY!
• Atoms give off and take in energy that can be
measured.
• These measurements help scientists to predict
the presence of certain types of atoms.
Paperclipium!!!
• Group of paper clips = PURE ELEMENT,
Paperclipium
• One paper clip = one ATOM of Paperclipium.
• If you cut the paper clip in half, does the paper
clip still work??
• If you split an ATOM, does the ATOM still
work?
Parts of an ATOM
ELECTRON SHELL
ELECTRON (-)
-
NEUTRON
(No charge)
+
(+)
NUCLEUS
+
-
Write down 5 observations about the atomic
model above.
Did you know?
• The ELECTRON has a NEGATIVE charge.
• The ELECTRON is always moving in the
ELECTRON SHELL. It moves too fast to locate.
• The PROTON has a POSITIVE charge.
• The NEUTRON has NO CHARGE.
• The center of the atom is made up of the
PROTONS and NEUTRONS and is called the
NUCLEUS.
PROTON + NEUTRON = ATOMIC MASS
• 4 p+ and 4 n = atomic mass?
• 8p+ and 7 n = atomic mass?
• 72 p+ and 92 n = atomic mass?
The atomic mass is the mass of the nucleus.
Why don’t we count electrons in the atomic
mass??
• ELECTRONS are so small that their mass
doesn’t matter!
For Example:
• Weigh a 4000 lb elephant. Then, pluck a few
hairs from the elephants head. Weigh the
elephant again, how much do you think it will
weigh now?
AND
• Silver is a pure element made of silver atoms.
• Gold is a pure element made of gold atoms.
• Do you think the atoms of silver and gold look
the same? Do you think they look different?
Explain?
• 47 protons
• 61 neutrons
• 47 electrons
• 79 protons
• 118 neutrons
• 79 electrons
What are the differences?
What is the atomic number of each element?
What do you notice about the number of protons and electrons?
BREATHE!!!
Atomic Number
Symbol
Name
Atomic Mass
protons or ________________.
electrons
ATOMIC NUMBER equals the number of ____________
protons + _______________.
neutrons
ATOMIC MASS equals the number of ______________
Can you fill in the blank???