RADIOACTIVITY WORKSHEET
Questions:
1. Why did Marie Curie receive a second Nobel Prize? (1)
For her isolation of radium
2. What happens to an atom with a nucleus that falls outside the
band of stability? (3)
The nucleus will undergo radioactive decay to form a more stable
nucleus
3. What are the symbols used to identify a neutron, a proton and an
electron in radioactive decay? (3)
4. Identify and explain THREE uses of radioisotopes. (6)
5. Explain what is meant by the statement ‘Chlorine has two
isotopes, chlorine-35 and chlorine-37’. (3)
Fill in the Blanks:
6. Pierre and Marie Curie discovered the radioactive elements
polonium and radium. (2)
7. Some isotopes are stable while other isotopes are unstable and
will undergo radioactive decay. (2)
8. Three types of radiation include alpha, beta and gamma. (3)
9. During radioactive decay, the nucleus will emit particles of
radiation in order to become more stable. (2)
10.
A common isotope used to diagnose thyroid disease is called
iodine-131, while iridium-192 is used as implants in the breast and
head. (2)
11.
Most elements occur in nature as a mixture of isotopes,
atoms with the characteristic number of protons of the element
but different numbers of neutrons. (1)
12.
In beta decay, the mass number stays the same, but the
number of protons increases by a unit of one. (3)
13.
Gamma rays are electromagnetic waves of short
wavelength. (2)
14.
As the atomic number of an element increases, the neutron
to proton ratio must also increase to keep the nucleus together.
(3)
True or False:
14.
The Nobel Prize for Physics in 1903 was awarded to Henri
Bacquerel, Pierre Currie and Marie Curie. True(1)
15.
Alpha particles are high-speed electrons. False (1)
16.
A proton is changed into neutron and electron during beta
decay. False (1)
17.
Heavy nuclei with an atomic number greater than 84 tends
to undergo gamma radiation. True (1)
https://studylib.net/doc/5893388/test-review-answers