Question

D. Circle the odd one.
1. Electrons; Nucleus; Protons; Neutrons
2. HO; H: CO, Cao
3. Sodium; Barium: Silicon: Aluminium
4. Electron; Proton: Mass Number: Neutron
5. Hydrogen; Helium; Neon; Argon​

Answer 1

1. nucleus

2. CAo

3. aluminum

4. mass number

5. hydrogen

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