What is the initial mass of Technetium-104? What is the half-life of Technetium-104?

What mass of Technetium-104 is left after
5 half-lives?

How much Technetium-104 will remain
after 2 hours?

For ai it's atomic number is 13 and it's mass number is 27 how many neutrons does it have

The characteristic of two different types of reactions are shown below. reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of and element. which statement is true about the atoms of the elements that participate in the two reactions? a: their identity changes in both reaction a and b. b: their identity changes in reaction a but not b. c: their identity changes in reaction b but not a. d: their identity remains the same.

Word equation for k(s)+h2o(l) yield koh(aq) + h2(g)