As given that the
a) temperature is same for both the metals
b) the volume of both the cubes is same (Same dimension)
The metals are sodium and calcium
Sodium has atomic number = 11
the electronic configuration is 1s2 2s2 2p6 3s1
It will attain noble gas configuration by easily losing one electron only
calcium has atomic number = 20
the electronic configuration is 1s2 2s2 2p6 3s2 3p6 4s2
It will attain noble gas configuration by donating two electrons so calcium is less reactive than sodium
hence the difference in the rate of reaction is most closely associated with the different nature of the metals
