*MULTIPLE CHOICE* Which of the following is an example of when an electron absorbs energy ?

• When an electron releases a photon.

• When it maintains constant energy and doesn’t change its energy level.

• When it goes from the second energy level to the fourth

• When it goes from the fourth energy level to the first.

The answer is the third choice because an electron goes into an excited state when energy is absorbed. Therefore, it will move to a higher energy level.

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