D. Circle the odd one.
1. Electrons; Nucleus; Protons; Neutrons
2. H 0; H; CÓ; CaO
3. Sodium; Barium; Silicon; Aluminium
4. Electron; Proton; Mass Number; Neutron
5. Hydrogen; Helium; Neon; Argon
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Answer:
potion 2 is the correct answer
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