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Atomic Structure And Radioactivity

37 Questions  I  By Shuling
Atomic Structure and Radioactivity
Review on the parts of the atom, atomic number, mass number and radioactivity.

  
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Question Excerpt

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1.  This subatomic particle has a negative charge.
A.
B.
C.
2.  The total number of these determines the mass number.
A.
B.
C.
3.  This particle has a mass that is about 1800 times smaller than the other two.
A.
B.
C.
4.  Isotopes of the same element have different numbers of these particles.
A.
B.
C.
5.  The number of these particles determines the atomic number
A.
B.
C.
D.
E.
6.  Found in the nucleus
A.
B.
C.
D.
7.  Has a positive charge
A.
B.
C.
8.  Has no charge
A.
B.
C.
9.  Has a mass of about 1 amu
A.
B.
C.
D.
E.
F.
10.     The number 14 is the:
A.
B.
C.
11.  The 28.09 is the:
A.
B.
C.
12.  You will need a periodic table for this one:A neutral atom of Pb-208 would have ? protons.
A.
B.
C.
13.  A neutral atom of Pb-208 would have ? neutrons.
A.
B.
C.
14.  A neutral atom of Pb-208 would have ? electrons.
A.
B.
C.
15.  Chlorine has two naturally occurring isotopes, Cl-35 with a relative abundance of 75.77% and Cl-37 with a relative abundance of 24.23%.  On a piece of paper, work out the average atomic mass of chlorine rounded to the nearest 1/100th of an amu. Check out the explanation if you get it wrong!
16.  Radium-211 has a half-life of 13 seconds.  If you started with 600 mg of Ra-211, how many seconds would it take until you only had 18.75 mg?
17.  The half-life of Radium-229 is 4 minutes.  What was the original mass (to the nearest 1/100th of a gram) of Ra-229 if .32 g remains after 12 minutes?
18.  Radium-226 has a half-life of 1600 years.  What percentage would be left (to the nearest 1/100th of a percent) after 6400 years?  Put a percent sign on your answer!
19.  In beta decay, a neutron undergoes a change into a ? and then an electron is ejected from the nucleus.
20.  In both fission and fusion, a small amount of ? is converted into energy.
21.  In nuclear fusion, atoms of hydrogen are combined under intense heat and pressure to form ?
22.  In nuclear fission, a ? strikes an atom of uranium (or plutonium) causing it to split.
23.  Isotopes of the same element have the same mass number but different atomic numbers.
A.
B.
24.  Over 99% of the mass of an atom is located within the tiny nucleus.
A.
B.
25.  Most of an atom's volume is empty space.
A.
B.
26.  The atomic number of an element is found by averaging the mass numbers of the isotopes and also takes into consideration the relative abundance of each isotope.
A.
B.
27.  The nucleus of an atom has no charge, it is neutral.
A.
B.
28.  In alpha decay, the nucleus ejects a particle that has two protons and two neutrons.
A.
B.
29.  In alpha decay, the atomic number decreases by 4 and the mass number decreases by 2.
A.
B.
30.  The radium nucleus here would be called:
A.
B.
C.
31.  The helium nucleus here would be called:
A.
B.
C.
32.  Which of the following is the best definition for half-life?
A.
B.
C.
D.
33.    The very last symbol above represents:
A.
B.
C.
D.
34.  How did the atomic number increase by one?
A.
B.
C.
D.
35.  Which answer is closest to the half-life of the parent shown here?
A.
B.
C.
D.
36.  This picture most closely shows:
A.
B.
C.
D.
E.
37.  The small white circles represent:
A.
B.
C.
D.
E.
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