Answer:
Oxygen, Argon, and Carbon.
Explanation:
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Oxygen ,boron and carbon are the non metallic elements. Thus, options B, C, and G are correct.
Non-metallic elements are the elements which easily form negative ions by accepting or gaining electrons and which do not have complete electronic configuration like rare gas. Non metals have high ionization energies and electronegativity.
They are generally poor conductors of heat and electricity. Solid non metals are generally brittle, with little or no metallic lustre.
Most non metals have the ability to gain electrons easily. Non metals display a wide range of chemical properties and reactivities.
In above except oxygen, boron and carbon all other elements are metallic in character that possess metallic property. Thus, options B, C, and G are correct.
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