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Q: Which among the following is a non-metal?
  • A. Aluminium
  • B. Nitrogen
  • C. Magnesium
  • D. Potassium
Correct Answer: Option B - Non-metals are those which lack all the metallic attributes. They are good insulators of heat and electricity due to absence or lack of free electron. They are mostly gases and sometimes liquid. Most are gases (hydrogen, helium, nitrogen, oxygen, fluorine, neon, chlorine, argon, krypton, xenon and radon); one is a liquid (bromine); and a few are solid (carbon, phosphorus, Sulphur, selenium, and iodine).
B. Non-metals are those which lack all the metallic attributes. They are good insulators of heat and electricity due to absence or lack of free electron. They are mostly gases and sometimes liquid. Most are gases (hydrogen, helium, nitrogen, oxygen, fluorine, neon, chlorine, argon, krypton, xenon and radon); one is a liquid (bromine); and a few are solid (carbon, phosphorus, Sulphur, selenium, and iodine).

Explanations:

Non-metals are those which lack all the metallic attributes. They are good insulators of heat and electricity due to absence or lack of free electron. They are mostly gases and sometimes liquid. Most are gases (hydrogen, helium, nitrogen, oxygen, fluorine, neon, chlorine, argon, krypton, xenon and radon); one is a liquid (bromine); and a few are solid (carbon, phosphorus, Sulphur, selenium, and iodine).