Question

what is the very smallest piece of magnesium possible?
a magnesium oxide molecule
a magnesium bar
a magnesium atom

Explanation:

To determine the smallest piece of magnesium, we analyze each option:

• A magnesium oxide molecule contains magnesium and oxygen, so it's not pure magnesium.
• A magnesium bar is a macroscopic piece, much larger than an atom.
• An atom is the smallest unit of an element that retains its chemical properties. So a magnesium atom is the smallest piece of magnesium.

Answer:

a magnesium atom