Question

The number of protons in the piece of sodium (density 0.971 g/cm3) is equal to the number of electrons in a piece of osmium. The volume of Os is 19 times lower than the volume of Na. Find the 

density of osmium.

Answer 1

$Density =\frac{mass}{volume}$

Density of Osmium$= 0.971×19=18.449g/cm^3$