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Chemistry STAAR Review
Test Description: 8th Grade Chemistry Review
Instructions: Answer all questions to get your test result.
1) How many protons does potassium have?
A
20
B
19
C
Same number as neutrons
D
39
2) What element has 3 energy levels and 2 valence electrons?
A
Lithium
B
Beryllium
C
Aluminum
D
Magnesuim
3) Which element is in group 6 and period 4
A
Selenium
B
None of the above
C
Tantalum
D
Silicon
4) Which element has a smaller atomic mass, but would react chemically similar to Sulfur?
A
Chlorine
B
Phosphorus
C
Oxygen
D
Tellurium
5) Which subatomic particle(s) make up the atomic mass of an atom?
A
Protons and Electrons
B
Electrons only
C
Protons and neutrons
D
Neutrons and Electrons
6) If an element has 17 protons, 18 neutrons and 17 electrons, what is its mass?
A
18 amu
B
35 amu
C
17 amu
D
34 amu
7) If an element has 38 protons, 50 neutrons and 38 electrons, how many negatively charged particles does it have?
A
50
B
88
C
38
D
126
8) How many valence electrons does Aluminum have?
A
27
B
13
C
3
D
8
9) An element has an atomic number of 21 and a mass number of 45. How many neutrons does the element have?
A
24
B
21
C
66
D
45
10) How many energy levels does Calcium (atomic number 20) have?
A
40
B
2
C
4
D
20
*select an answer for all questions
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