Which Rare Earth Element are used in common electronic goods? Briefly explain the rare earth elements role. Which Rare Earth Elements are used in clean energy technologies? Briefly explain the rare earth elements role.

h let me think

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8

c. electrical charges of ionic bonds.

the objects have the same charge.