For an element, the basic particle type is?

For an element, the basic particle type is?

• A. Atom
• B. Molecule
• C. Formula Unit
• D. Ion

Answer: (A)

The fundamental idea is that an element is defined by its atoms—the smallest unit that retains the element’s identity. While some elements exist as diatomic or polyatomic molecules, those molecules are built from atoms, and the atom remains the basic particle. A molecule is simply a cluster of atoms held together, a formula unit is the smallest repeating piece in a crystal, and an ion is a charged variant. Therefore, the basic particle type for an element is an atom.

The fundamental idea is that an element is defined by its atoms—the smallest unit that retains the element’s identity. While some elements exist as diatomic or polyatomic molecules, those molecules are built from atoms, and the atom remains the basic particle. A molecule is simply a cluster of atoms held together, a formula unit is the smallest repeating piece in a crystal, and an ion is a charged variant. Therefore, the basic particle type for an element is an atom.