Strontium-90 is a radioactive isotope that is formed in nuclear explosions. The half-life of strontium-90 is 28 years. If a soil sample contains 35 pCi of strontium-90 in 2000, what will be the activity of the Pºsr in this soil sample in 2084?
(Enter your answer to two significant figures.)
pCi

the term hydride is commonly named after binary compounds that hydrogen forms with other elements of the periodic table. hydride compounds in general form with almost any element, except a few noble gases. the trends and properties vary according to the type of intermolecular force that bonds the elements together, the temperature, its molecular masses, and other components. hydrides are classified into three major groups, depending on what elements the hydrogen bonds to. the three major groups are covalent, ionic, and metallic hydrides. formally, hydride is known as the negative ion of a hydrogen, h-, also called a hydride ion. because of this negative charge, hydrides have reducing, or basic properties. its special characteristics will be further discussed.

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