Iodine-126 is a beta emitter with a half-life of 13 days. What is the mass of iodine-126 in a 8.0-mg sample of the isotope at the end of 39 days?

Afusion reaction takes place between carbon and another element. neutrons are released, and a different element is formed. the different element is a) lighter than helium.b)heavier than helium.c)the same weight as helium.d)dependent on the element that reacted with carbon.

What kind of intermolecular forces act between a hydrogen fluoride molecule and a hydrogen peroxide molecule? note: if there is more than one type of intermolecular force that acts, be sure to list them all, with a comma between the name of each force.

Which of the following is described by the equation h2o(s)+ heat=h2o(i) a freezing melting condensing evaporating