Chemistry 51 - Fundamentals of Chemistry » Fall 2021 » Chapter 2 and 3 Additional Questions

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Question #1
An unknown atom has the following subatomic particles: 61 electrons, 60 neutrons, and 60 protons. What is the charge of this atom?
A.   -2
B.   -1
C.   1
D.   2
Question #2
An unknown atom has the following subatomic particles: 132 electrons, 141 neutrons, and 131 protons. What is the mass number of this atom?
A.   200
B.   222
C.   212
D.   272
Question #3
An atom of platinum (Pt) has a mass number of 195. How many neutrons does this atom have?
A.   110
B.   170
C.   117
D.   100
Question #4
A new element is discovered and named Newelementium (Nw). This new element is known to have two naturally occurring isotopes. The atomic masses of the two isotopes are measured to be: 320.301 amu (Nw-320) and 335.265 amu (Nw-335). If the natural abundance of Nw-320 is 16.14%, what is the atomic mass of this new element? Round your final answer to two decimal places.
A.   347.15
B.   332.85
C.   300.85
D.   313.25
Question #5
An atom of nitrogen that has a charge of -2 has how many valence electrons?
A.   4
B.   7
C.   5
D.   2
Question #6
An atom of sulfur (S) has a charge of 2. How many electrons are in its 3p orbital?
A.   5
B.   3
C.   4
D.   2
Question #7
An atom of antimony (Sb) has a valence shell of "5s2 4d10 5p6". How many total electrons does this atom have?
A.   50
B.   48
C.   40
D.   54

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