Suppose you have an unknown mineral sample. you can scratch the mineral with a pen knife but not with your fingernail. the mineral is most likely
a. talc
b. diamond
c. apatite
d. gypsum

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.

Astudent is asked to identify and element that is pale yellow brittle solid and does not conduct electricity. at which location in this periodic table would the element most likely be found?

What is the molecular weight of copper