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WorksheetsDiscovery of radioactive
Total questions: 12
Worksheet time: 12mins
Name
Class
Date
1.
What makes something radioactive?
a)
elements with an atomic number above 81
b)
an unstable nucleus
c)
contaminated sewage
d)
It decays over time
2.
_______________ is the process by which unstable atoms emit radiation until they become stable.
a)
Radiation
b)
Chemical Reaction
c)
Radioactive Decay
d)
Isotopes
3.
What particle is released when an unstable isotope undergoes alpha radiation?
a)
a helium nucleus
b)
an electron
c)
a photon of light
d)
a neutron
4.
Which type of radioactive decay is occurring in this equation?
a)
Alpha decay
b)
beta decay
c)
gamma decay
d)
positron emission
5.
The rate at which a radioactive element decays is its ____.
a)
quarter life
b)
whole life
c)
wonderful life
d)
half life
6.
If the half life of a radioactive element is 100yrs, how long would it take for the radioactivity to reduce by one half?
a)
200yrs
b)
100yrs
c)
50yrs
d)
300yrs
7.
What is Half-life?
a)
The amount of time it takes for some of the nuclei in a sample of the isotope to decay
b)
The amount of time it takes for half the electrons in a sample of the isotope to decay
c)
The amount of time it takes for half the nuclei in a sample of the isotope to decay
d)
the amount of time it takes to double the nuclei in a sample of the isotope to decay
8.
The half-life of Zn-71 is 2.4 minutes. If one had 100.0 g at the beginning, how many grams would be left after 7.2 minutes has elapsed?
a)
100.0g
b)
50.0g
c)
12.5g
d)
8.5g
9.
How many protons does this isotope have?
a)
131
b)
53
c)
184
d)
78
10.
Which scientist’s discovery of mysterious radiation from uranium first sparked Marie Curie’s interest?
a)
Pierre Curie
b)
Henri Becquerel
c)
Alfred Nobel
d)
Albert Einstein
11.
What new elements did Marie and Pierre Curie discover?
a)
Uranium and polonium
b)
Radium and polonium
c)
Radium and uranium
d)
Radium and thorium
12.
Which best describes the results of Becquerel’s experiments?
a)
When placed in sunlight, the uranium did not form an image and when placed in darkness, the uranium did form an image.
b)
When placed in sunlight, the uranium did form an image and when placed in darkness, the uranium did not form an image.
c)
Both formed images when placed in their respective places.
d)
Neither formed images when placed in their respective places.
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