In a nuclear chain reaction, each fission reaction can lead directly to 1. one more fission reaction.
2. two more fission reactions.
3. three more fission reactions.
4. four more fission reactions.

Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.

How many neutrons does a atom of cobalt have?

Which of the following units is not an official si unit