Answer Happy

Please help me answer all of them correctly.
(a) Atoms are very small compared to objects on the macroscopic scale. The radius of a niobium atom is 143 pm. What is this value in meters and in centimeters? m (b) The mass of a single niobium atom is 1.54x10-22 g. Suppose enough Nb atoms were lined up like beads on a string to span a distance of 42.5 cm (17 inches). How many atoms would be required? atoms What mass in grams of Nb would be used? g How many niobium atoms does this represent? cm Could you weigh out this amount of niobium using a typical laboratory balance? (c) Taking the density of niobium metal to be 8.57 g/cm3, calculate the mass of metal needed to form a piece of Nb wire with the same length as the distance in b, but with a diameter of 1.50 mm. Hint: The volume of a cylinder is n times its radius squared times its height. (V = n r² h) g atoms