Focus On Physical Science: California Grade 8

Lesson 2: Isotopes and Radioactivity

Standards Check

1.
__________ are atoms of the same element that have different numbers of neutrons. 7.b
A)Compounds
B)Isotopes
C)Alpha particles
D)Beta particles
2.
The __________ of an isotope is the number of neutrons plus protons. 7.b
A)nucleus number
B)atomic number
C)mass number
D)half-life
3.
Which of the following would cause a nucleus to be unstable? 7.b
A)protons and neutrons packed tightly in the nucleus
B)equal numbers of protons and neutrons
C)the release of an alpha particle from americium-241 in a smoke detector
D)too many neutrons
4.
__________ is the release of nuclear particles and energy. 7.b
A)Transmutation
B)Atomic half-life
C)Radioactive decay
D)Carbon dating
5.
The changing of one element into another through radioactive decay is called __________ . 7.b
A)half-life
B)transmutation
C)periodic shift
D)nuclear fusion
6.
The __________ of a radioactive isotope is the amount of time it takes for half of a sample of the element to decay. 7.b
A)atomic number
B)transmutation rate
C)rate of degradation
D)half-life
7.
Elements created by artificial transmutations are called __________. 7.b
A)alpha products
B)isotopes
C)degraded elements
D)synthetic elements
Grade 8
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