Unit 3 Skills Review
1. How many significant digits are in…
a. 0.0012
_____
b. 92,000
_____
c. 72,010
_____
d. 120.00
_____
e. 0.001200
_____
f. 1.245 x 10-5
_______
2, Give the correctly rounded answers…
a. 12.345 + 23.1 + 8.9123
_____________
b. 345.00 x 2.122
_____________
c. 300 x 2.12
_____________
3. Give the element represented by
a. 1s22s22p63s23p64s23d9
b. [Ne]3s23p5
c. 6f3
4. Give the abbreviated EC electron configuration for…
a. tellurium
b. hafnium
5. In tantalum, how many protons? __________ electrons? ____________ nuetrons?_________
6. How many valence electrons are in…
a. phosphorus _________
b. argon __________
c. hydrogen _________
d. gold __________
7. What is the valence charge of…
a. selenium ______
8. Give an example of…
a. transition metal
b. alkali metal
b. helium ______
c. sulfate ________
d. sulfur ________
c. noble gas
d. non-metal
e. semiconductor
9. Draw the electron dot structure for…
a. sulfur ________ b. helium __________ c. carbon __________ d. phosphorus ___________
10. Give the chemical formula and word name for a compound made by combining…
a. strontium and oxygen
________
_______________________________
b. strontium and chlorine
________
_______________________________
c. sulfur and tungsten
________
_______________________________
d. two bromine atoms
________
________________________________
e. arsenic andosmium
________
________________________________
f. magnesium and platinum
________
________________________________
g. ammonium and chlorine
________
________________________________
h. sodium and hydroxide
________
________________________________
i. potassium and phosphate
________
________________________________
j. acetate and magnesium
________
________________________________
k. lithium and sulfate
________
________________________________
l. hydrogen and cyanide
________
________________________________
m. oxygen and hydrogen
________
________________________________
n. oxygen and carbon
________
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