Example B2: Magnesium + Iodine. Example B3: Potassium + Iodine. Example B4: Sodium + Oxygen. Example B5: Calcium + Chlorine. Example B6: Aluminum + Ch...
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Speaking Question 1. Sample Answer: Mountain biking is my favorite leisure activity. I began mountain biking about two years ago after my cousin went away to college and gave me his mountain bike. At first, I was afraid of falling, but I eventually o
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T. Trimpe 2007 http://sciencespot.net/ Atomic Basics Answer Key Part A: Atomic Structure 1. Draw five protons in the nucleus of the atom
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CB8=B; 5G=7G
ANSWER KEY
Section A: Complete the chart using a periodic table to help you.
Element
Atomic Symbol
Total # of Electrons
# of Valence Electrons
# of Electrons Needed to Gain or Lose
Oxidation Number
(to Fill Outer Shell)
Chlorine
Cl
17
7
Gain 1
1-
Potassium
K
19
1
Lose 1
1+
Magnesium
Mg
12
2
Lose 2
2+
Fluorine
F
9
7
Gain 1
1-
Aluminum
Al
13
3
Lose 3
3+
Sodium
Na
11
1
Lose 1
1+
Nitrogen
N
14
4
Gain 3
3-
Oxygen
O
8
6
Gain 2
2-
Hydrogen
H
1
1
Gain or Lose 1
1+ or 1-
Carbon
C
6
4
Gain or Lose 4
4+ or 4-
Iodine
I
53
7
Gain 1
1-
Answer these questions:
An atom that gains one or more electrons will have a NEGATIVE charge.
An atom that loses one or more electrons will have a POSTIVE charge.
An atom that gains or loses one or more electrons is called an ION.
A positive ion is called a CATION and a negative ion is called an ANION.
T. Trimpe & L. Bogner 2008
http://sciencespot.net/
Section B: Ionic Bonds
ANSWER KEY
What is an ionic bond? Atoms will transfer one or more electrons to another to form the bond. Each atom is left with a complete outer shell. An ionic bond forms between a metal ion with a positive charge and a nonmetal ion with a negative charge. Example B1: Sodium + Chlorine
Challenge: What are some other ionic bonds that can be formed by the elements you see? Write the chemical formula for the compound and its name. Answers will vary.
T. Trimpe & L. Bogner 2008
http://sciencespot.net/
ANSWER KEY
Section C: Covalent Bonds
What is a covalent bond? Atoms share one or more electrons with each other to form the bond. Each atom is left with a complete outer shell. A covalent bond forms between two nonmetals. Example C1: Hydrogen + Hydrogen
