Download (null): 096.AtomReview

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03/03/14
Resources:
AtomOverview.ppt (which includes
YLDOI.FirstGrader.ppt)
Homework for 03/04: Read 284-291 / Nine Numbers of Neutrons
Bell Work:
Pick elements
Review (no notes)
1. Rutherford: rebound of alpha particles (recall “Unseen”)
2. Bohr: spectrum of light emitted from energized atoms
a. Energize atoms using heat or electricity
b. Electrons jump up to higher energy “floors”
c. Electrons jump back down to specific “floors” and emit
light with specific energy = specific color
d. Color of light allows us to calculate energies of
electrons WITHOUT BEING ABLE TO “SEE” THEM
3. Show spectrum of zinc atom:
a. Each specific color tells us about the structure of
specific electrons inside the atom
b. Zinc spectrum s different from ANY other element (compare
to sulfur and helium on same slide)
E. Atomic structure basics (see AtomOverview.ppt) – what we’ve
learned by seeing without seeing …
1. PROTONS:
a. Location = nucleus
b. Number = constant for each element = ATOMIC NUMBER (see
PT)
c. Function = determines identity
2. ELECTRONS:
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a. Location = outer cloud
b. Number = usually same as protons (atomic number) but can
be added or removed (to form “ions”)
c. Function = determines chemistry
3. NEUTRONS
a. Location = nucleus
b. Number = varies (in different “isotopes”)
1) Atomic mass = p + n (see PT)
2) Atomic number = p
3) Atomic mass – atomic number = n
1) YLDOI: Are you smarter than a first grader?
c. Function = stability
Go to Isotopes …