Transcript Chapter 17:

Ch. 17 Quick Write
Using ANY previous knowledge you have,
spend 5 minutes writing about the
following things:
• What are the positive and negative parts of
an atom called?
• Explain why the periodic table is
important in the world of science.
• Draw or verbally explain the structure of
Chapter 17
an atom.
Chapter 17: Atoms and the
Periodic Table
What is your age? What grade are
you in? What are your initials? What
are some other ways that people are
categorized and named?
Chapter 17
17.1 Elements contain a single kind of atom
A. Element = Single kind of atom
1. What is an atom?
2. Element Examples? Gold, Nitrogen, Graphite
in pencils
3. All listed on chart called periodic table
4. Atomic symbol – letters that stand for a
symbol
a. Like initials
b. Only first letter capitalized
c. Examples? C, O, Na, Au
Chapter 17
17.1 Elements contain a single kind of atom
There are more atoms in a
breath of air than the total
number of humans since
time zero!
B. Atoms
1. Too small to see
2. Made up of smaller, subatomic parts:
electrons (e-), neutrons (n), protons (p)
3. Nucleus – contains protons & neutrons
4. Electrons surround the nucleus
Chapter 17
Group Activity
• Turn in your books to page 305.
• Discuss Exercise 1 and 2 using what you
know about atoms.
Chapter 17
17.2 Atoms are mostly empty space
Atoms are mostly empty space
Why does it matter
1. Only electron repulsion
that atoms are
keeps atoms from passing
mostly empty
space?
through one another
2. Touching is actually
repulsing!
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Chapter 17
17.4 Protons and Neutrons Determine Mass Number and Atomic Mass
E. Isotopes
1. Mass Number – number of protons & neutrons
2. Mass number – Atomic number = number of
neutrons
3. Example: Carbon has a mass number of 12
and an atomic number of 6, how many
neutrons does it have?
4. Atomic mass = total mass of an
atom
*Assignment: Mass and Atomic Number WS
Chapter 17
Quick Activity
Group the following fruits: orange, apple,
banana, kiwi, strawberry, watermelon,
cantaloupe, grape, peach, apricot, plum,
nectarine.
You must have at least 2 groups and no more
than 5. Discuss as a group why you’ve
classified the fruit the way you have. What
are some features or characteristics that
made you put the fruit into the groups?
Chapter 17
Chapter 17
17.5 Elements are organized in the Periodic Table by Their
Properties
F. Grouping elements
1. Metals
What are
characteristics
of metals?
a. Shiny, opaque, good
conductors
b. Malleable
c. Ductile – can be pulled into
wires
d. Mostly solid at room
temperature
e. Examples: sodium,
magnesium, gold, mercury,
iron
Chapter 17
17.5 Elements are organized in the Periodic Table by Their
Properties
2. Nonmetals – Right side of the table
What are
characteristics
of nonmetals?
a.
b.
c.
d.
e.
Poor conductors
Can be transparent
Brittle and shatter when hammered
Solid, liquid, or gas
Examples: sulfur, oxygen, chlorine,
iodine, fluorine
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What are
properties
of
metalloids?
3. Metalloids – between metals
and nonmetals
a.
Weak conductors of
electricity,
b. used as semiconductors in
computers
c. More metallic properties
d. Examples: Boron, Silicon
Chapter 17
17.6 A Period is a Horizontal Row, a Group is a Vertical Column
G. Periods and Groups
What is the
difference
between a period
and a group?
1. Horizontal row = Period
a. Atomic size gets smaller from
left to right
2. Vertical row = Group
a. Similar properties
b. Atomic size gets larger from
top to bottom
c. Alkali (A-1), Alkaline-earth
(A-2), Transition (middle),
Halogens (form salts, 17-S),
Noble Gases (kings, end)
Chapter 17
Partner Assignment (10-15 Min)
Read 17.5-17.6 (pg. 297-303)
The Notquite Table of the Elements WS –
working in pairs, correct the worksheet to
make the table and the statements correct
Chapter 17