Protactinium has 516 years of half life how many decays will it go through to become 1/64th of the substance? ,

Explanation:

Each half life period reduced the amount of substance by half

So 6 of half life cycles or decays will go.

in theory, limestone is composed principally of the compound calcium carbonate - caco3, but in reality this compound is deposited in conditions involving a number of other compounds as impurities so it ends up being a mixture of many compounds.

hope this : -)

tony (lordcaos066)