4) A cation is an atom that has a. Gained one or more electrcns
b. Gained a negative charge
c. Obtained a positive charge
d. The ability to repel electrons

Scientists often have to 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 number in an alternate form.