Bond character is used to describe the severity of the electronegativity differences between the two atoms involved in a bond. Bonds that have character correspond to a larger difference in electronegativities, and bond character corresponds to a smaller difference. For example, increasing the electronegativity of atom "A" in the PhET simulation and decreasing the electronegativity of atom "B" will result in a bond that is ionic in character.

Icant see the pictures 

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

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