Regarding the formula al2o3 which of the following is accurate?
a. the coefficient 3 indicates that there are a total of three atoms of oxygen present in the substance.
b. the subscript 2 indicates that two atoms of oxygen are present in the substance.
c. the chemical symbol al indicates that oxygen is present in the substance.
d. the subscript 2 indicates that two atoms of aluminum are present in the substance

The question says,'regarding the formular Al2O3, which of the following is accurate. The correct option is D. The subscript indicate that there are two atoms of aluminium in the compound. The subscript 3 indicates that, there are three atoms of oxygen in the molecule. The figure 3 attach to oxygen is a subscript not a coefficient, that is why option A is not correct.

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

Idon't know hope someone you