How many moles of atoms are in 3.067x1023 atoms? (1 mole = 6.02 x 10% things )
a. 0.509 moles
b. 1.846 moles
c. 1.962 moles
d. 0.889 moles

Alarge marble is dropped in a graduated cylinder with 35ml of water in it.the water level increases to 49ml.what is the volume of the marble

Who discovered a pattern to the elements in 1869?

Which of the following is in the lanthanide family? a) uranium b) promethium c) silver d) gold