16 The half-life of uranium-235 is 700 million years. If there are 1000 g of uranium-235 in the original sample, what happens after 2100 million years have passed? Select all that apply One half-life has passed D. 125 g of the original sample remains . Two half-lives have passed. 250 g of the original sample remains C. Three half-lives have passed 500 g of the original sample remains.

Examine the false statement. compounds are the smallest unit of an element that occur most commonly in nature. select the rewording of the statement that is true. a: atoms are the smallest unit of an element that commonly occur in nature. b: molecules are the smallest unit of an element or compound that commonly occur in nature. c: molecules are the smallest unit of a compound that occur on the periodic table. d: compounds are the smallest unit of an element that occur on the periodic table