Identify the CORRECT decreasing order of melting point of cluster of sodium atoms depending on size.

Calculate the molar mass of an element having density $$21 \mathrm{~g} \mathrm{~cm}^{-3}$$ that forms fcc unit cell $$\left[\mathrm{a}^3 \cdot \mathrm{N}_{\mathrm{A}}=36 \mathrm{~cm}^3 \mathrm{~mol}^{-1}\right]$$

Which from following metal has ccp crystal structure?

Find the radius of metal atom in simple cubic unit cell having edge length 334.7 pm?