This chart show the amount of radioactivity measured from three unknown isotopes.

which statement describes each of the isotopes?
isotope a was measured at day 24, isotope b was measured at day 6, and isotope c was measured at day 10.
isotope a was measured at day 18, isotope b was measured at day 4, and isotope c was measured at day 5.
isotope a was measured at day 24, isotope b was measured at day 8, and isotope c was measured at day 20.
isotope a was measured at day 30, isotope b was measured at day 6, and isotope c was measured at day 10.

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.

explanation: