Chemistry STAAR Review Question Preview (ID: 47071)


8th Grade Chemistry Review. TEACHERS: click here for quick copy question ID numbers.

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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