8 th Grade Science T. Trimpe 2008
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Transcript of 8 th Grade Science T. Trimpe 2008
8th Grade Science
T. Trimpe 2008 http://sciencespot.net/
Section A: Complete the chart using a periodic table to help you.
Element
Atomic Symb
ol
Total # of electro
ns
# of Valance Electron
s
# of Electrons gained or
lost
Oxidation Numbe
r
Chlorine
Potassium
Magnesium
Fluorine
Aluminum
Sodium
Nitrogen
Oxygen
Carbon
Iodine
Section A: Complete the chart using a periodic table to help you.
Check your work!
Element
Atomic Symb
ol
Total # of electro
ns
# of Valance Electron
s
# of Electrons gained or
lost
Oxidation Numbe
r
Chlorine Cl 17 7 1 gained -1
Potassium K 19 1 1 lost +1
Magnesium Mg 12 2 2 lost +2
Fluorine F 9 7 1 gained -1
Aluminum Al 13 3 3 lost +3
Sodium Na 11 1 1 lost +1
Nitrogen N 7 5 3 gained -3
Oxygen O 8 6 2 gained -2
Carbon C 6 4 4 gained or
lost +/- 4
Iodine I 53 7 1 gained -1
Answer these questions:
An atom that gains one or more electrons will have a ____________________ charge.
An atom that loses one or more electrons will have a ____________________ charge.
An atom that gains or loses one or more electrons is called an ____________.
A positive ion is called a ______________ and a negative ion is called an _______________.
POSITIVE
NEGATIVE
ION
CATIONANION
“An-Eye-On”“Cat-Eye-On”
What is an ionic bond?
Atoms will transfer one or more ________________ to another to form the bond.
Each atom is left with a ________________ outer shell.
An ionic bond forms between a ___________ ion with a positive charge and a ________________ ion with a negative charge.
ELECTRONS
COMPLETE
METALNONMETAL
Steps for Ionic Bonding1. draw dot diagrams2. Transfer Electrons with arrows 3. (Draw more dot diagrams)4. Write ions (atom with a charge.5. Formula- write it out!
Example B1: Sodium + Chlorine Example B2: Magnesium + Iodine
Example B3: Potassium + Iodine Example B4: Sodium + Oxygen
Example B5: Calcium + Chlorine Example B6: Aluminum + Chlorine
What is a covalent bond?
Atoms ___________ one or more electrons with each other to form the bond.
Each atom is left with a ________________ outer shell.
A covalent bond forms between two _________________.
SHARE
COMPLETE
NONMETAL
Steps for Covalent Bonding1. Draw dot diagrams2. Drw Circles ( e- that are shared)3. (Draw more dot diagrams)4. Line Drawings5. Formula- write it out!
Example C1: Hydrogen + Hydrogen Example C2: 2 Hydrogen + Oxygen
Example C3: Chlorine + Chlorine Example C4: Oxygen + Oxygen
Example C5: Carbon + 2 Oxygen Example C6: Carbon + 4 Hydrogen