Multiple choice

Atoms are composed of

  1. electrons only

  2. protons only

  3. electrons and protons

  4. electrons and nuclei
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Atoms consist of a central nucleus containing protons and neutrons, surrounded by electrons in orbitals. The nucleus contains nearly all the mass, while electrons occupy most of the volume. Atoms are not composed of electrons or protons alone - both components are essential for atomic structure.

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