The half-life of Radium-226 is 1590 years. If a sample contains 300 mg, how many mg will remain after 1000 years

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.

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tony (lordcaos066)

the objects have the same charge.

the correct answer would be b) volume versus temperature, because they are also directly proportional.