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WARM-UP

#9
JAN. 23
Map Projections
Mercator: accurate direction, distortion of size and
distance.
 Gnomonic: accurate at point of tangency, large
distortion further out.
 Conic: accurate over a small region, inaccurate over
long range.
 Robinson: accurate in direction, less distortion of
size and distance than mercator.


What is a compound composed of?
MAPS & MAPPING REVIEW
 Each
Student gets a card
 You will wander around the room until I say
stop, then find a partner that is close to you
 Each partner takes turns asking the other
the question
 Then they trade questions and start again
There will be a couple of you that don’t have
one. Just keep trading and it will work out.
Many of these questions you might see on
your test…hint, hint.
ATOMIC STRUCTURE
Chapter 2
STRUCTURE OF THE ATOM
 There

are two regions
The nucleus
Contains protons and neutrons
 Positively charged
 Almost all the mass


Electron cloud
Where the electrons are found
 Most of the volume of the atom

SIZE OF AN ATOM
 The
nucleus is tiny compared to the
atom
IF the atom was the size of a stadium,
the nucleus would be the size of a
marble
 Radius of the nucleus near 10-15 meters



0.000000000000001 m
Density is near 1014 g/cm3
SUBATOMIC PARTICLES
Name
Symbol
Charge
Relative
mass
1/1840
Actual
mass
Electron
e-
-1
Proton
p+
+1
1
1.67 x 10-24
Neutron
n0
0
1
1.67 x 10-24
crap
9.11 x 10-28
COUNTING THE PIECES
Atomic Number = number of protons
 # of protons determines what kind of atom
 The same as the number of electrons in the
neutral atom
 Mass Number = the number of protons +
neutrons.

ISOTOPES

Atoms of the same element can have different
numbers of neutrons.

This leads to a difference in mass number
These are called isotopes
 The atomic mass on the periodic table is the
average of the mass of the isotopes.

NAMING ISOTOPES
Put the mass number after the name of the
element
Ex:

Carbon – 12
 Carbon – 14
 Uranium – 235

SYMBOLS

The symbol of an element contains the mass
number and the atomic number:
Mass
Number
Atomic
Number
SYMBOLS
Find the:
1. Number of Protons
2. Number of Neutrons
3. Number of Electrons
4. Atomic Number
5. Mass Number
19
9
SYMBOLS
Find the:
1. Number of Protons
2. Number of Neutrons
3. Number of Electrons
4. Atomic Number
5. Mass Number
80
35
Br
SYMBOLS
If an element has an
atomic number of
34 and a mass of 78
what is the:
Number of Protons
Number of Neutrons
Number of Electrons
Complete symbol
78
34
Se
SYMBOLS
If an element has 91
protons and 140
neutrons what is
the:
Atomic Number
Mass Number
Number of Electrons
Complete symbol
Pa
231
91
SYMBOLS
If an element has 78
electrons and 117
neutrons what is the:
Atomic Number
Mass Number
Number of Electrons
Complete symbol
Pt
195
78
TICKET OUT THE DOOR
1.
Tell the # of the p+, n0, e- and name for
the isotope:
18
6
2.
3.
C
What is a compound?
What are the 3 subatomic particles, their
relative masses, relative charges, and
location?