$($a$)$ Atoms are very small compared to objects on the macroscopic scale. The radius of a tungsten atom is $137pm.$ What is this value in meters and in centimeters? $\_\_$

$mc{m}^{cm}$

$($b$)$ The mass of a single tungsten atom is $3\mathrm{.}05{10}^{-22}g.$ Suppose enough $W$ atoms were lined up like beads on a string to span a distance of $47\mathrm{.}0cm(19$ inches$).$ How many atoms would be required? $\_\_\_$atoms

What mass in grams of $W$ would be used?

$\_\_\_$g

Could you weigh out this amount of tungsten using a typical laboratory balance?

$($c$)$ Taking the density of tungsten metal to be $19\mathrm{.}2\frac{g}{c}{m}^3,$ calculate the mass of metal needed to forhn a piece of W wire with the same length as the distance in $b,$ but with a diameter of $1\mathrm{.}50mm.$ Hint: The volume of a cylinder is $$ times its radius squared times its height. $($V$=r^{2}h)\_\_\_$g

How many tungsten atoms does this represent? atoms