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16) E.
17) A. I dan V
18) C.
19) M + H2SO4 --> MSO4 + H2
Mol M = mol H2SO4
gram/Ar = 0,1
5,6/Ar = 0,1
Ar = 56
Neutron : 56-26=30 (D.)
20) E. n=2; l=0; m=0, s=-1/2
21) A. VIB periode 4