Graphite breaks apart when it is rubbed. Which measure on the hardness scale matches the hardness of graphite? a 1

b 4

c 8

d 10

Nuclear fusion is the source of energy for stars. besides hydrogen, which other element is most likely also common in stars?

If the element whose electric configuration ends in the d sublevel, the element is calssified as? a.inner transition b.noble gases c.representative d. transition

Provide a stepwise curved arrow mechanism that fully explains the outcome of the reaction shown below. oh нао* heat он