October 2018 1 131 Report
Lima unsur A,B,C,D dan E masing -masing mempunyai susunan elektron sbb:
a.1s2,2s2,2p6,3s1
b.1s2,2s2,2p6,3s2
c.1s2,2s2,2p6,3s2,3p1
d.1s2,2s2,2p6,3s2,3p6,3d10,4s1
e.1s2,2s2,2p6,3s2,3p6,3d10,4s2,4p6,5s1
pasangkan yg merupakan unsur dari satu golongan yg sama adalah

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