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.   -1
B.   1
C.   2
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.   222
B.   200
C.   272
D.   212
Question #3
An atom of platinum (Pt) has a mass number of 195. How many neutrons does this atom have?
A.   110
B.   100
C.   117
D.   170
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.   300.85
B.   313.25
C.   332.85
D.   347.15
Question #5
An atom of nitrogen that has a charge of -2 has how many valence electrons?
A.   7
B.   5
C.   4
D.   2
Question #6
An atom of sulfur (S) has a charge of 2. How many electrons are in its 3p orbital?
A.   2
B.   4
C.   3
D.   5
Question #7
An atom of antimony (Sb) has a valence shell of "5s2 4d10 5p6". How many total electrons does this atom have?
A.   48
B.   40
C.   54
D.   50

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