Question 26 of 33 How many energy levels contain electrons in an atom of calcium (Ca)?
The Periodic Table
A. Three
B. Four
C. One
D. Two

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

Which is an example of the practical pursuit of alchemy? a. forming perfect substances. b. transforming base metals. c. developing metalworking techniques. d. linking spiritual characteristics with material substances.

Select the correct answer. wax is a nonpolar substance. in which type of substance is it most soluble?