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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.