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Helium is an unreactive gas and neon is ...

Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common?

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**Step-by-Step Solution:** 1. **Identify the Elements**: The question refers to two noble gases: helium (He) and neon (Ne). 2. **Understand Noble Gases**: Noble gases are known for their lack of reactivity due to their stable electronic configurations. They are located in Group 18 of the periodic table. 3. **Electronic Configuration of Helium**: Helium has an atomic number of 2, which means it has 2 electrons. Its electronic configuration is 1s². This configuration indicates that its only energy level (K-shell) is fully filled with 2 electrons, following the duplet rule. ...
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