Seating Chart and Bell WorkRow 11. Prince

Larry2. Kaydee

McGlawn3. Marquis

Johnson4. Alexander

Williams5. Alicia

Sodachanh

Row 21. Anfernee

Beal2. Brittaney

Demus3. Shameka

Langston4. Alexis

Ingram5. Zechariah

Ray

Row 31. Charles

Coody2. DeRandom

Clark3. Stephanie

Collum4. Mindy

McConnell5. Kelsey

Anderson

Row 41. William

Elverton2. DeeDra

Lawyer3. Matthew

Walker4. Jeremy

White5. Angela

Davis

Row 51. Christuntay

Haymon2. Tre Foster

3. DeOndria Carter

4. Aaron Hicks

5. Empty

• What grade do you think you made on your test?• What grade do you think you will have on your

report card?

Seating Chart and Bell WorkRow 11. Kristopher

Williams2. Gevarious

Nelson3. Colby

Barton4. Rosatta

Bowman5. Empty

Row 21. Marlo

Watkins2. Hayley

Douglas3. Fredrick

Vancleave4. Jonathan

Demita5. Xavier Young

Row 31. Tricia

Warren2. DeQuan

Mitchell3. Jonathan

Manor4. Naikesha

Knox5. Empty

Row 41. Kadavious

Williams2. Amina

Nolan3. Joshua

Davidson4. Tyler

Hamil5. Empty

Row 51. Antonio

Young2. Haley

Rogers3. Edward

Taylor4. Brandon

Harber5. Empty

• What grade do you think you made on your test?• What grade do you think you will have on your

report card?

Seating Chart and Bell WorkRow 11. Devin

Blackwell2. Meaghanne

Adams3. Charkilia

Jackson4. Zaria

Knight5. Empty

Row 21. Virginia

McCurdy2. DeAndre

McNeil3. Justin

Milner4. Empty 5. Empty

Row 31. Dalton

Davis2. LeeAnna

Massey3. Morgan

Purvis4. Empty 5. Empty

Row 41. Stephen

Johnson2. Deolana

Bang3. Ricky

Stagg4. Empty 5. Empty

Row 51. Shannon

Williams2. Edwin

Watts3. Heather

King4. Empty 5. Empty

• What grade do you think you made on your test?• What grade do you think you will have on your

report card?

New Rules

• Students will not leave the classroom for any reason. Students will be given only 1 emergency leave each 9 weeks.

Physical Science – Lecture 31

Introduction to Chemistry

What are Atoms?

• The atom is a basic unit of matter that consists of a dense, central nucleus surrounded by a cloud of negatively charged electrons.

Nucleus

• In the middle of an atom is its nucleus.• The nucleus is positive and contains– Protons –positively charged subatomic particle– Neutrons – subatomic particle with no charge

Subatomic Particles

• Subatomic particle is proton, neutron, or electron.

• They are found inside an atom.

• Electrons are negatively charged.

Where are Electrons?

• Electron cloud – space where electrons are likely to be found.

• Energy level – most likely location in an electron cloud where an electron will be found.

Atom

Atom

The Periodic Table

• Organizational Structure for the elements that lines them up in predictable patterns.

Periodic Law

• Arranged in order of increasing atomic number

• Similar periodic properties• Similar chemical properties

Periods

Groups

What are elements?

• An Element is a fundamental substance that has it’s own properties.

• Elements make up compounds.

Three classes of elements

• Metals• Metalloids• Non-metals

Metals

• Good conductors of heat and electricity• High luster or sheen (reflect light)• Solid at room temperature (except mercury)• Ductile (made into wires)• Malleable (hammered into thin sheets)

Non-metals

• Upper right hand corner• Greater variation • Most are gases, some are solids, bromine is a

liquid• Poor conductors (except carbon)• Brittle

Metalloids

• Either side of stair step• Metal and non-metal properties• Behave different under different conditions

Periodic Table Squares

Element Name

• A specific name is given to each element on the periodic table.

• However, many Periodic Tables do not include element names because scientists are expected to memorize them.

Element Symbol

• Each element has a specific one or two letter symbol that is used interchangeably with its name.

Atomic Number

• Atomic number is the number of protons in the nucleus of an atom.

• Elements are arranged according to this number.

Atomic Mass/ Atomic Weight

• The atomic mass (also called atomic weight) of an element is the combined number of protons and neutrons in the nucleus.

• The periodic table lists the average atomic mass of all the isotopes.

Isotopes

• Isotope – atom that has the same number of protons as another atom, but a different number of neutrons.

• They are the same element, but have different masses.