list the outer electron configurations for the atoms in period three from left to right?
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Period three starts with sodium; One outer s electron (3s1) next is magnesium; two s electrons (3s2) then comes aluminium (3s2, 3p1) and silicon (3s2, 3p2) phosphorus (3s2, 3p3) sulphur (3s2, 3p4) chlorine (3s2, 3p5) and finally argon which has a full outer shell; 3s2, 3p6
