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 an atom.

Chapter 17

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

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

There are more atoms in a breath of air than the total number of humans since time

zero!

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

1. Only electron repulsion keeps atoms from passing through one another

2. Touching is actually

repulsing!

Why does it matter that atoms are mostly empty space?

Chapter 17

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 ActivityGroup 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 elements1. 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

What are characteristics of metals?

Chapter 17

17.5 Elements are organized in the Periodic Table by Their Properties

2. Nonmetals – Right side of the tablea. Poor conductors

b. Can be transparent

c. Brittle and shatter when hammered

d. Solid, liquid, or gas

e. Examples: sulfur, oxygen, chlorine, iodine, fluorine

What are characteristics of nonmetals?

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

What are properties of metalloids?

Chapter 17

17.6 A Period is a Horizontal Row, a Group is a Vertical Column

G. Periods and Groups1. Horizontal row = Period

a. Atomic size gets smaller from left to right

2. Vertical row = Groupa. 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)

What is the difference between a period and a group?

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