A sample of a radioactive isotope initially contains 20 x 1010 After 16 days, 5 x 1010 atoms remain. What is the half–life of the isotope? Group of answer choices

What is the chemical formula of the following compound

Can someone me with questions 15 to 17 plz.

Which statements are true concerning mineral formation? check all that apply. the slower the cooling, the larger the crystals. the faster the cooling, the smaller the crystals. crystals formed from magma are smaller than crystals formed from lava. minerals can only form in solutions when the solution is heated deep underground. when a solution cools, elements and compounds leave the solution and crystallize as minerals. minerals formed from hot water solutions can form narrow channels in the surrounding rock.