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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
39
D
Same number as neutrons
2) What element has 3 energy levels and 2 valence electrons?
A
Aluminum
B
Lithium
C
Beryllium
D
Magnesuim
3) Which element is in group 6 and period 4
A
Tantalum
B
Selenium
C
Silicon
D
None of the above
4) Which element has a smaller atomic mass, but would react chemically similar to Sulfur?
A
Phosphorus
B
Oxygen
C
Tellurium
D
Chlorine
5) Which subatomic particle(s) make up the atomic mass of an atom?
A
Protons and neutrons
B
Protons and Electrons
C
Neutrons and Electrons
D
Electrons only
6) If an element has 17 protons, 18 neutrons and 17 electrons, what is its mass?
A
35 amu
B
18 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
126
B
88
C
38
D
50
8) How many valence electrons does Aluminum have?
A
3
B
27
C
8
D
13
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
45
C
66
D
21
10) How many energy levels does Calcium (atomic number 20) have?
A
4
B
40
C
20
D
2
*select an answer for all questions
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