3.3 parts of an atom handout and highlight. parts of an atom
TRANSCRIPT
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3.3 Parts of an Atom
Handout and highlight
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Parts of an Atom
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Proton, Electron, and Neutron chart
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What is the name of atom A?Hydrogen
What is the name of atom B?Oxygen
88
8
1
1116
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Subatomic Particles(Protons, Neutrons, and
Electrons)The number of protons in an atom is
called the atomic number. If you know the atomic number of an
atom, you know how many protons – and how many electrons – the atom contains.
# of protons = # of electrons (e-) The mass number is the sum of
protons and neutrons in the atom.
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Therefore, if you know the atomic number (the number of protons) and the mass number (the sum of protons and neutrons), you can easily calculate the number of neutrons.
Number of Neutrons = mass number – atomic number
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Standard Atomic Notation
We represent the numbers of subatomic particles by using standard atomic notation.
35 (35 = mass #)Example Cl (Cl = chemical
sym.)17 (17 = atomic #)
# of protons = # of electrons (e-) = # of neutrons =
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1. At# = #P = # E2. At Mass = #P + #N3. #N = At mass – At#
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Counting Atoms Review
CaCO3
NaNO3
NaCl
C9H8O4
C2H4O2
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Handout BLM 3.3Subatomic Particles worksheet
• Do for homework