chemistry october 20, 2014 atomic concept atomic number and mass number
TRANSCRIPT
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CHEMISTRYOCTOBER 20, 2014
ATOMIC CONCEPTATOMIC NUMBER AND MASS
NUMBER
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SCIENCE STARTER
• You are seated and quiet• You have 2 minutes•Do the SCIENCE STARTER
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AIM
•How do we read the periodic table?
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PUZZLES
• Using the Periodic Table, solve the puzzles. You are given 10 minutes.• You may work with a partner. Both
partners must be actively participating. I will be walking around grading you on your participation. • Stop when you see the stop sign
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DEBRIEF
• So, what is the atomic number?• How did you know where to find it?• How did you know what is the
number of protons?• How did you know what is the
number of electrons?
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VOCABULARY
•ATOMIC NUMBER•MASS NUMBER•ATOMIC MASS•ATOMIC MASS UNIT•PERIODIC TABLE
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ATOMIC NUMBER
• the number of protons that an atom has in its nucleus
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MASS NUMBER
• number of neutrons and protons in an atom for an element
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ATOMIC MASS
•weighted average mass of an atom of an element based on the relative abundance of that element’s isotopes
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ATOMIC MASS UNIT
•unit for atomic mass
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PERIODIC TABLE
• a table of the chemical elements arranged in order of atomic number, usually in rows, so that elements with similar atomic structure (and hence similar chemical properties) appear in vertical columns.
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One atomic mass unit
•1/12 of the mass of a carbon atom that contains 6 protons and 6 neutrons
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AMU
•Proton = 1 amu•Neutron = 1 amu• Electron = 0 amu (almost
zero so do not count)
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READING THE PERIODIC TABLE• Element = Carbon• Symbol = C• Atomic Number = 6• Atomic Mass = 12.0107 amu• Mass Number = 12• Number of Protons = 6• Number of Electrons = 6• Number of Neutrons = 6
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TRY ITElement Symbol Atomic
NumberAtomic Mass Mass
NumberProton Neutron Electron
Hydrogen
Oxygen
Krypton
Helium
Lithium
Gold
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Element Symbol Atomic Number
Atomic Mass Mass Number
Proton Neutron Electron
Hydrogen H 1 1.00794 amu 1 1 0 1
Oxygen O 8 15.9994 amu 16 8 8 8
Krypton Kr 36 83.798 amu 84 36 48 36
Helium He 2 4.002602 amu
4 2 2 2
Lithium Li 3 6.94 amu 7 3 4 3Gold Au 79 196.966569
amu197 79 118 79