How many electrons does it take to fill the outer energy level of most atoms

The reaction q+r2=r2q is found to be first order in r2 and

Mitosis is a type of cell division that produces cells that are identical to the parent cell. meiosis is a different type of cell division that produces cells that carry have a genetic material of the parent cell. based on the information provided how do the purpose of mitosis and meiosis differ

What is true for a substance that releases energy