Question

Which element in group 1 has the highest density?

Answer 1

1. 
   Density is the measurement of the ratio of mass per unit volume.
2. It depends on the temperature and pressure which should be specified.
3. Density is represented as:
   $\mathrm{\rho }=\frac{\mathrm{m}}{\mathrm{V}};$where $\mathrm{\rho }$is the density, m is the mass and V is the volume.
4. Density is measured in $\frac{\mathrm{Kg}}{{\mathrm{m}}^3}$
5. The group 1 element consist of Lithium$\left(\mathrm{Li}\right)$, Sodium$\left(\mathrm{Na}\right)$, Potassium$\left(K\right)$, Rubidium$\left(\mathrm{Rb}\right)$, Cesium$\left(\mathrm{Cs}\right)$, Francium$\left(\mathrm{Fr}\right)$.
6. They are called alkali metals.
7. The atomic number of Francium is $87.$
8. Among all Francium has the highest density which is equal to $2.48\mathrm{g}/{\mathrm{cm}}^3$