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Catalyst. Objective. SWBAT explain how the periodic table is set up. SWBAT identify & calculate atomic number. SWBAT identify & calculate atomic mass / mass number. Periodic Table Set Up 10.23.2008. Elements. Elements have a characteristic (unique) set of chemical & physical properties.

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objective
Objective
  • SWBAT explain how the periodic table is set up.
  • SWBAT identify & calculate atomic number.
  • SWBAT identify & calculate atomic mass / mass number.
elements
Elements

Elements have a characteristic (unique) set of chemical & physical properties.

First organized into “periodic table” by Russian Chemist Mendeleev

elements1
Elements

There is a universally understood symbol for each element. An element is represented in one of 2 ways:

1. A capitalletter

Boron:

Sulfur:

Potassium:

elements2
Elements

There is a universally understood symbol for each element. An element is represented in one of 2 ways:

1. A capitalletter

Boron: B

Sulfur: S

Potassium: K (from the Latin: Kalium)

elements3
Elements

There is a universally understood symbol for each element. An element is represented in one of 2 ways:

2. A capitalletter + lowercase letter

Calcium:

Magnesium:

Silicon:

elements4
Elements

There is a universally understood symbol for each element. An element is represented in one of 2 ways:

2. A capitalletter + lowercase letter

Calcium: Ca

Magnesium: Mg

Silicon: Si

reading periodic table
Reading Periodic Table

Atomic #

Symbol

Name

Atomic Mass / Mass #

periodic table set up 10 23 20084

Periodic Table Set Up 10.23.2008

Atomic #

Symbol

Atomic Mass / Mass #

Name

atomic
Atomic #

Elements are distinguished from each other in the periodic table based on the number of protons in the nucleus

atomic1
Atomic #

Atomic # is equal to the number of protons (p+) in the nucleus.

periodic table set up 10 23 20085

Atomic #

Periodic Table Set Up 10.23.2008

Symbol

Atomic Mass / Mass #

Name

atomic2
Atomic #

Atomic # is equal to the number of protons (p+) in the nucleus.

Uncharged atoms have the same # of protons & electrons.

periodic table set up 10 23 20086

Atomic #

Periodic Table Set Up 10.23.2008

Symbol

Atomic Mass / Mass #

Name

atomic3
Atomic #
  • The atomic # is 6.
  • What is the number of protons?
  • 6 protons
  • What is the # of electrons?
  • 6 electrons
periodic table set up 10 23 20087

Atomic #

Periodic Table Set Up 10.23.2008

Symbol

Atomic Mass / Mass #

Name

slide22
Mass #

Another way to distinguish elements is by their total mass.

Mass # = # protons + # neutrons

Why doesn’t the mass # include the electrons?

  • Electrons have an extremely small mass that barely contributes to the overall mass!
slide24
Mass #

Ex. 1: If an atom has 5 protons and 5 neutrons, what is the mass #?

Mass # = 5p+ + 5n0 = 10

slide26
Mass #

Ex. 2: If an atom has a mass # of 17 and has 8 protons, what is the number of neutrons in the atom?

# neutrons = mass # - # protons = 17-8 = 9

slide28
Mass #

Ex. 3: If an atom has a mass # of 22 and an atomic # of 11, what is the number of neutrons?

Atomic # = # protons = 11

# neutrons = mass # - # protons = 22-11 = 11

summary
Summary
  • Take a few minutes to make a summary of today’s notes.
  • When done, work on your HW Packet!