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The noble gases have weak interatomic force, and consequently have very low melting and boiling points. They are all monatomic gases under standard conditions, including the elements with larger atomic masses than many normally solid elements.
Answer Wiki. The noble gases have full valence shells, making them very unlikely to give or receive electrons, which means they have very high ionization energy or very low electronic affinity energy. Since all reaction involves the transfer or sharing of electrons, it is difficult for noble gases to react.