For the crystal structure shown at right how many atoms are

For the crystal structure shown at right how many atoms are there per unit cell (i.e., \"inside\" the unit cell)? CIRCLE THE BEST ANSWER 1 2 3 4 5

Solution

Share of a unit cell present in corner of crystal structure = (1/8)

Share of a unit cell present in centre of crystal structure = (1)

No of unit cells present at each corner    = 8

No of unit cells present at centre              = 1

Total no of unit cells = (1/8)*8+1*1 = 2

so option (B) is the answer