PSC 2121 Lecture Notes - Lecture 2: Boron, Bromine, Chemical Formula

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27 Apr 2016
School
Course
Physical Science PSC2121
Ch 15 - Class Participation
1. What is the valence shell?
A) It is the outermost shell of electrons in an atom.
B) It is the shell of electrons in an atom that is the least reactive.
C) It is the last partially filled orbital in an atom.
D) It is the shell of electrons in element V (atomic no. = 23)
E) It is the same as the orbital configuration.
2. Which of the following is the correct electron dot structure for chlorine (atomic no. =
17)?
A) a
B) b
C) c
D) d
E) e
3. Which of the following is the correct electron dot structure for carbon (atomic no. = 6)?
A) a
B) b
C) c
D) d
E) e
4. How many valence electrons does boron (B, atomic no. = 5) have?
A) 1
B) 2
C) 3
D) 4
E) 5
5. How many valence electrons does bromine (Br, atomic no. = 35) have?
A) 1
B) 7
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Physical Science PSC2121
C) 21
D) 28
E) 35
6. Which of the following elements has six valence electrons?
A) Be
B) B
C) C
D) N
E) O
7. An atom loses an electron to another atom. Is this an example of a physical or chemical
change?
A)physical change involving the formation of negative ions
B) chemical change involving the formation of neutral atoms
C) physical change involving the formation of positive ions
D) chemical change involving the formation of ions
8. Which of the following elements will most likely not form an ion at all?
A) Na
B) O
C) Ar
D) Mg
E) Br
9. Which of the following elements will most likely form an ion with a -1 charge?
A) Na
B) S
C) Ne
D) Mg
E) Cl
10. Which of the following elements will most likely form an ion with a -2 charge?
A) Na
B) S
C) Ne
D) Mg
E) Cl
11. Which of the following elements will most likely form an ion with a +1 charge?
A) Na
B) Mg
C) Al
D) Si
E) Cl
12. Which of the following would be an ion with a double positive charge?
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