Which of the following forms cations that can have different charges?
a. lead
b. cobalt
c. Cr
d. Ce
e. all of the above
Which among the following elements does not exist as a diatomic molecule in nature?
a. hydrogen
b. nitrogen
c. fluorine
d. neon
e. none of these
What is the charge on the radium ion?
a. 1+
b. 2+
c. 3+
d. 1-
e. 2-
What is the correct formula of a compound that contains three sulfide ions and two aluminum ions?
a. S3Al2
b. S2Al3
c. Al2S3
d. Al3S2
e. none of the above
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