Why are there eight stages in meiosis but not in mitosis?

What I don’t know:)

Theoretically, which metal should be the most reactive? hydrogen lithium francium fluorine

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

What energy is it when you flip on a switch on a lamp