How much Cu-64 (half-life about 12 hours) would remain from a 2 mg sample after 12 hours? Reported if not real answers, I need this to graduate

can you explain it better it seems you marked a but was that annacident or

Explanation:

i think it is d. e because the next one is igneous.

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.