Polonium-214 has a relatively short half-life of 164 seconds. How many seconds would it take for 8,0 g of this isotope to decay to 0.25 g?

An electrons position cannot be known precisely only it's probability of being in a certain location can be known

Which common material is an example of a polymer? (25 pts) a. steel b. plastic c. petroleum d. rubbing alcohol

What rule is used to determine how many covalent bonds an element can form? a. the number of covalent bonds is equal to six c the number of covalent bonds is equal to five minus the group number plus the group number b. the number of covalent bonds is equal to eight d. none of the above minus the group number select the best answer from the choices provided