The elements that suits each given property for each of the empty boxes is as described below.
For the first box, the property is that it is a conductor and that it has 2 energy levels. The only possible options here will be Lithium (Li) and Beryllium because they are both conductors and have 2 energy levels. However, among the given elements, only Li is given and as such we will select that.
For the second box, the property is that it is a conductor, it has 3 energy levels and has 2 valence electrons. The only element that falls into this category is Magnesium (Mg).
For the third box, the property is that it is a conductor, it has 3 energy levels and has 1 valence electron. The only element that falls into this category is Sodium (Na).
For the fourth box, the property is that it is not a conductor and has 3 energy levels. The only elements that falls into this category are Silicon(Si), Phosphorus(P), Sulphur(S), Argon(Ar). The only given option is Sulphur(S) and we will pick that.
For the fifth box, the property is that it is not a conductor and has 4 energy levels and 7 valence electrons. The only element that falls into this category is Bromine(Br).
For the sixth box, the property is that it is not a conductor and has 4 energy levels and 5 valence electrons. The only element that falls into this category is Arsenic (As).
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