Chemistry STAAR Review Question Preview (ID: 47071)
8th Grade Chemistry Review.
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How many protons does potassium have?
a) 39
b) 20
c) 19
d) Same number as neutrons
What element has 3 energy levels and 2 valence electrons?
a) Beryllium
b) Magnesuim
c) Aluminum
d) Lithium
Which element is in group 6 and period 4
a) Selenium
b) Tantalum
c) Silicon
d) None of the above
Which element has a smaller atomic mass, but would react chemically similar to Sulfur?
a) Tellurium
b) Phosphorus
c) Chlorine
d) Oxygen
Which subatomic particle(s) make up the atomic mass of an atom?
a) Protons and neutrons
b) Electrons only
c) Neutrons and Electrons
d) Protons and Electrons
If an element has 17 protons, 18 neutrons and 17 electrons, what is its mass?
a) 35 amu
b) 17 amu
c) 18 amu
d) 34 amu
If an element has 38 protons, 50 neutrons and 38 electrons, how many negatively charged particles does it have?
a) 88
b) 38
c) 50
d) 126
How many valence electrons does Aluminum have?
a) 27
b) 13
c) 3
d) 8
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) 21
d) 66
How many energy levels does Calcium (atomic number 20) have?
a) 20
b) 2
c) 40
d) 4
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