What are the constituent ions in the ionic compound fecr2o7
a: 1fe+ cation and 1 cr2o7-
b: 1fe2+ cation and 1 cr2o7-
c 1fe2+ cation 2 cr6+cations and 7 o2- anions
s
d 1 fecr2 14 cation 7 o2- anions

Scientists often deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each of these numbers in an alternate form.