If a sample initially contains 100 g of a radioactive isotope, how much will be left after 3 half lives? question 1 options: 50 g 25 g 12.5 g 6.25 g

3) in peaches, [oh]=3.16x10-11 m a) find [h+ ] b) what is the ph? c) is the solution acidic, basic, or neutral?

An atom's configuration based on its number of electrons ends at 3p4. another atom has seven more electrons. starting at 3p, what is the remaining configuration? 3p63d34s2 3p43d54s2 3p64s23d3 3p44s23d

What is the molar mass of ca(cio4)2