One level back to Chemical elements 2.2.3.3.3.1.1. [Non-metals] 2.2.3.3.3.1.1.1. [Chemical basic elements] 2.2.3.3.3.1.1.2. [Reactive Elements]. 2.2.3.3.3.1.1.3. [Noble gases] (Helium, Neon, Agrgon etc.) One level further to [Chemical basic elements] One level further to [Reactive Elements]. One level further to [Noble gases] (Helium, Neon, Agrgon etc.)
One level back to Chemical elements 2.2.3.3.3.1.1. [Non-metals] One level further to [Chemical basic elements] One level further to [Reactive Elements]. One level further to [Noble gases] (Helium, Neon, Agrgon etc.) [Chemical basic elements] [Chemical basic elements] 2.2.3.3.3.1.1.1. [Chemical basic elements] One level further to Nitrogen One level further to Oxygen and hydrogen One level further to Carbon One level back to [Chemical basic elements] 2.2.3.3.3.1.1.1.1. Nitrogen One level back to [Chemical basic elements] 2.2.3.3.3.1.1.1.2. Oxygen and hydrogen One level back to [Chemical basic elements] 2.2.3.3.3.1.1.1.3. Carbon [Reactive Elements]. [Reactive Elements]. 2.2.3.3.3.1.1.2. [Reactive Elements]. One level further to [Phosphorus] One level further to [Sulphur] One level further to [Halogens] One level back to [Reactive Elements]. 2.2.3.3.3.1.1.2.1. [Phosphorus] One level back to [Reactive Elements]. 2.2.3.3.3.1.1.2.2. [Sulphur] One level back to [Reactive Elements]. 2.2.3.3.3.1.1.2.3. [Halogens] 2.2.3.3.3.1.1.2.3.1. [Fluorine] 2.2.3.3.3.1.1.2.3.2. [Chlorine] 2.2.3.3.3.1.1.2.3.3. [Bromine] One level further to [Fluorine] One level further to [Chlorine] One level further to [Bromine] [Noble gases] (Helium, Neon, Agrgon etc.) [Noble gases] (Helium, Neon, Agrgon etc.) 2.2.3.3.3.1.1.3. [Noble gases] (Helium, Neon, Agrgon etc.)

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[Non-metals]