Question

what is the meaning of least reactive in periodic classificarion​

Answer 1

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Noble gases are the least reactive elements in the periodic table because they have a full valence shell.  

The least reactive elements in the periodic table are the noble gases or sometimes the inert gases. These are the elements of Group 18, and they have full valence shells. They are not interested in loaning out or borrowning electrons, and are very stable.  

The gases helium, neon, argon, krypton, xenon and radon make up the inert gases.  

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