2
3
4
5
Correct answer is D
Its electronic configuration in ground state is 1s2 2s2 2p6 3s2 3p6 4s1 3d5.
The gas given off when NH4 Cl is heated with an alkali is...
An oxide XO2 has a vapour density of 32. What is the atomic mass of X? ...
MnO-4(aq) + Y + 5Fe2+(aq) → Mn2+(aq) + 5Fe2+(aq) + 4H2O(l) In the equation above, Y is...
The contact process is used for the industrial production of ...