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.

Use the periodic table to determine the electron configuration of dysprosium (dy) and americium (am) in noble-gas notation.

Achemist wants to extract copper metal from copper chloride solution. the chemist places 0.50 grams of aluminum foil in a solution containing 0.75 grams of copper (ii) chloride. a single replacement reaction takes place. (ii) chloride. a single replacement reaction takes place. which statement explains the maximum amount of copper that the chemist can extract using this reaction? a) approximately 0.36 grams, because copper (ii) chloride acts as a limiting reactant b) approximately 1.8 grams, because copper (ii) chloride acts as a limiting reactant c) approximately 0.36 grams, because aluminum acts as a limiting reactant d) approximately 1.8 grams, because aluminum acts as a limiting reactant

Structure of the atoms: discovery of the nucleus in 1909i need answering all of these questions