10) aluminum is a highly reactive metal that oxidizes when exposed to air. which of these would be a good first step in balancing this reaction? al + o2 → al2o3

Hello!

(Missing)

A)Put a coefficient of 3 on Al
B)Put a coefficient of 3 on O2
C)Put a coefficient of 2 on O2
D)Put a coefficient of 3 on Al2O3

A good first step to balance this reaction is Put a coefficient of 3 on O₂.

All the other options don't balance an atom but putting a coefficient of 3 on O₂ achieves the goal of starting to balance Oxygen on both sides of the equation. The next step after that would be to put a coefficient of 2 on Al₂O₃ and there would be 6 Oxygen atoms on both sides of the equation.

Have a nice day!

Its a hope this

Zinc contains about 30 protons