Give an example of a gaseous non-metal.

Answer: 

Non-metals are the elements which form negative ions by accepting or gaining electrons. Non-metals usually have 4, 5, 6 or 7 electrons in their outermost shell. Characteristic properties of non-metals are high ionization energies and high electronegativity.

List of non-metals, their states and symbol

Non-metal State at Room Temperature Symbol
Hydrogen Gas H
Nitrogen Gas N
Oxygen Gas O
Fluorine Gas F
Chlorine Gas Cl
Bromine Liquid Br
Iodine Solid I
Carbon Solid C
Sulphur Solid S
Phosphorous Solid P
Silicon Solid Si

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