Question 21 (3 points) Fluorine-20 has a half-life of 11 seconds. How long does it take for 34.0 g of Fluorine-20 to decay to 2.13 g?
(Answer with numbers only 2 significant figures. No unit.)

Asap! will give brainiest when a heat wave strikes a region causing more people to run air-conditioning units, electrical demand increases. what needs to be done to meet this increased demand? raising the control rodslowering the control rodsremoving the control rods

Name the element in group 17, period 2. (periodic table)

What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons? a) 6 b) 8 c) + 1 d) 12 e) 18