A sample of francium-212 will decay to one-fourth its original amount after 40 min. What is the half-life of francium-212?

Calcium chloride +gold(1) oxide—>

Find the number of moles of argon in 364g of argon.

What is the importance of interlocking the fingers and rubbing while washing hands? the palms are the dirtiest parts of the hands. the spaces between the fingers get washed. the backs of the hands get washed. the fingernails are the dirtiest parts of the hands