Tuesday September 29, 2015

TO DO RIGHT NOW:

1. Have a seat in your old seat 2. Title page 42- UNIT 3 “Atomic Theory”3. Page 43- Parts of the Atom Notes4. Page 44- The History of Atomic Chemistry Notes5. Update your table of contents

HOMEWORK Due Thursday Atomic Structure Worksheet REMINDERS

• Quiz on FRIDAY• No tutorials tomorrow• Tutorials are 7:00-7:25 am and 2:40-3:00pm (quick questions only• Get scientific calculator!!!• Check grades online!

Atom• The smallest particle of an element (that keeps

the properties of the element).Three types of subatomic particles:–Proton (p+)–Neutron (n0)– Electron (e-)

Reading the Periodic Table

Atomic Number

Since atom is neutral p+ = e-

Element Symbol

Atomic massElement Name

Atomic Number = # of p+

Atomic mass = p+ + n0

Bohr model of the atom

Yep! Somebody lied when they told you 8! We’ll go into details in Unit 4.

• 1. Draw five protons in the nucleus of the atom. Label them with their charge.

• 2. Draw six neutrons in the nucleus of the atom.

• 3. Draw two electrons in the first energy levels and label them with their charge.

• 4. Draw three electrons in the second energy level and label them with their charge.

• 5. What element is represented by the diagram?

+

+

++

+

-

--

-

-

Boron

Identify this atom: (assuming it is neutral p+ = e-)

NUCLEAR NOTATION

16O8

HYPHEN NOTATION

Element Symbol – Atomic mass Oxygen -- 16

Atom Boards

Protons

Electrons

Neutrons

Element Symbol Mass Atomic # Proton Neutron Electron

Calcium

Boron

Ca 40 20 20 2020

B 11 5 5 56