An element has half-life 1000 years. In the year 2000, there was 100 kg of it in existence. a) How much was there is the year 1000? (No need to show work.) 2 of 2000 = 1000 2, of looky - 50 kg b) How much will there be in the year 3000? (No need to show work.) 2 1300 7 = 10oek(309) c) How long will it take until there is less than 1 kg? Explain how you got your answer, which you may get any way you like