Assuming you had the same concentration in solution of each compound, CaF2, NH4CI,
Na3PO4 and they dissociated completely:
Which would you expect to be the weakest electrolyte and strongest electrolytes ?
3
O NHACI
O CaF2
O Na3PO4

the answer is 1 i believe

i do not get it   at all

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

the answer is d.) potassium