题目内容

For a ClF4+ ion, how many valence electrons should be shown in the Lewis structure? ( )

A. 32
B. 33
C. 34
D. 35

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The oxidation number of S in NaHSO3 is ( )

A. -2
B. 0
C. +4
D. +6

What is the highest oxidation number expected for sulfur in its compounds? ( )

A. +2
B. +4
C. +6
D. +8

Which compound has the highest lattice energy? ( )

A. CaBr2
B. CaCl2
CaO
D. CaS

The chemistry of which element involves the greatest variety of oxidation-reduction reaction? ( )

A. Ca
B. Cl
C. F
D. Ne