How many atoms are there in the unit cell of the face- centered cubic (FCC) unit cell?

How many phosphorus atoms are there in 2.57g of this element? How many valence(outer shell)electrons are present in the atoms of the element with atomic number51(about Chemistry) How many atoms are there in the unit cell of the face- centered cubic (FCC) unit cell? The relative atomic mass scale makes it possible to know how many atoms of an element are element接上面 are present in a sample of the element with a measurable mass.这句话的句子成分怎么划分啊? how many bears are How many derks are how many trees are how many books are I don't know__sheep there__on the farmA.how many ,areB.how much ,are请问为什么 how many legs are there? how many stop are there How many pears are there? How many stars are there? How many birdges are there? HOW MANY BOOKS ARE THERE How many people are zhere? How many people are there? How many apples are these