Answer:
I,Br,Cl,F
Explanation:
ionization energy decreases the farther down an element is
I believe it is water..... I think.
They are organized into crystals hope i helped
C10H8N2O2S2
C=12,H=1,N=14,O=16,S=32
R. F. M (Relative Formula Mass)=(12*10)+8+(2*14)+(2*16)+(2*32)
Number of moles =given mass/formula mass
=29/252
=0.1151 moles