In nature, copper has two isotopes: Cu-63 and Cu-65 with abundance 69 % and 31% respectively. Calculate the average atomic mass of copper.

Geothermal energy for industrial use is available almost anywhere. a.true b.false

Word equation for k(s)+h2o(l) yield koh(aq) + h2(g)

Which reason best explains why metals are malleable? a)because they have delocalized electrons b)because they have localized electrons c)because they have ionic bonds d)because they have rigid bonds