When copper is heated with an excess of sulfur, copper (I) sulfide is formed. In a given experiment, 1.50 g copper was heated with excess sulfur to yield 1.57 g of copper (I) sulfide. 2 Cu (s) + S (s) --> Cu2S (s)

What is the percent yield?

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

increased stability in the completion of fluorine's outer shell.