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Chemistry
8th Grade
NGSS covered
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33 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
The technetium-99 isotope has a half-life of 6.0 hours. If 100.0 mg were injected into a patient how much remains after 18 hours?
33.0 mg
12.5 mg
.33 mg
15.8 mg
2.
MULTIPLE CHOICE QUESTION
5 sec • 12 pts
In a correctly written symbol what would be located in the "A" position?
3.
MULTIPLE CHOICE QUESTION
10 sec • 1 pt
How many protons are in this atom?
3
4
6
10
4.
MULTIPLE CHOICE QUESTION
10 sec • 1 pt
What is the name of the pictured isotope?
Copper-29
Copper-63
Copper-34
Copper-43
5.
MULTIPLE CHOICE QUESTION
10 sec • 1 pt
Rubidium-87 with atomic number of 37 gives off a beta particle. What will be the resulting isotope?
Br-85 with atomic number of 35
Strontium-87 with atomic number of 38
Yttrium-87 with atomic number of 39
Kr-87 with atomic number of 36
6.
MULTIPLE CHOICE QUESTION
10 sec • 1 pt
These three isotopes of carbon have different -
Atomic numbers
Mass numbers
Numbers of protons
Symbols
7.
MULTIPLE CHOICE QUESTION
10 sec • 1 pt

How many neutrons are in this isotope of Uranium?
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