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gol= 2+1= III A
per= 3
b. Ar] 4s2 3d10 4p5
per= 4
gol= 2+5= VII A
c. He] 2s2 2p4
per= 2
gol= 2+4= VI A
d. Kr] 5s2 4d10 5p5
per= 5
gol= 2+5= VII A