The office of a member of the council becomes vacant:
(1) Upon the incumbent's:
(a) Death
(b) Adjudicated incompetence, or
(c) Recall from the office.
(2) Upon declaration by the council of the vacancy in case of the incumbent's:
(a) Failure, following election or appointment to the office, to qualify as specified in Section 25, for the office within ten days after the time for his/her term of office to begin,
(b) Unexplained absence from all meetings of the council within a 45-day period.
(c) Ceasing to reside in the city.
(d) Ceasing to be a qualified elector under state law.
(e) Conviction of a public offense punishable by loss of liberty.
(f) Resignation from the office.