In which group of modern periodic table do solid liquid and gaseous elements occur?
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Gases:
Nitrogen- Group 15.
Oxygen- Group 16.
Hydrogen- Group 1.
Helium, Neon, Argon, Krypton, Radon - Group 18
Chlorine- Group 17.
Liquid elements:
Mercury- Group 12
Bromine- Group 17
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