Characterize the following atoms as being either nucleophilic or electrophilic. note: if one or more atoms are incorrectly placed, a single red x will appear on the top left.

(1) mg in mgo
(2) al in alcl3
(3) s in h2s
(4) hidrogen ion, h+

1 , 2 and 4→ Electrophilic

3 → Nucleophilic

Explanation:

1) since the O has higher electronegativity than Mg the electronic density in the bond will be shifted towards O , leaving Mg with partial positive charge → then Mg will be electrophilic since it will be attracted to compounds where there is a high electronic density.

2) since Cl has higher electronegativity than Al  , the electronic density will be shifted towards the 3 Cl atoms and leaving Al with partial positive charge → then Al will be electrophilic since it will be attracted to compounds where there is a high electronic density.

3) since S has higher electronegativity than H and also has lone electronic pairs, the electronic density will be shifted towards the S atom , leaving S with partial negative  charge → then S will be nucleophilic

3) since H+ has a positive charge will be attracted to compounds where there is a high electronic density.→ then H+ will be electrophilic

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  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-