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a. 0
b. +4
c. +2
d. +7
e. +6
No. 2
a. N=+3 ; O=-2
b. Na=+1 ; N=+5 ; O=-2
c. K=+1 ; Cr=+6; O=-2
d. Cr = +6; O=-2
e. P=+5 ; O=-2