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metals and non-metals — Science STD 10 — Question

Gujarat BoardEnglish MediumSTD 10Sciencemetals and non-metals3 Marks
Question
State the exceptions of metallic and non-metallic elements.
✓

Answer

  • Exceptions of metallic elements:
  • $(1)$ All metals except mercury are solids at room temperature, while mercury is a liquid at room temperature.
  • $(2)$ Generally, metals have high melting points but Galium and Caesium have very low melting points.
  • $(3)$ Alkali metals (Lithium, sodium, potassium) are very soft hence, they can be cut with a knife, while other metals cannot be cut with a knife.
  • Exceptions of non-metallic elements:
  • $(1)$ Generally, non-metals exist as solids or gases at room temperature while bromine is a liquid.
  • $(2)$ Non-metals does not possess lustre, but iodine is the only non-metal which possesses lustre.
  • $(3)$ Non-metals have low melting points, but the diamond, an allotrope of carbon possesses very high melting point.
  • $(4)$ Non-metals are generally non-conductors of electricity, but the graphite, an allotrope of carbon is the only non-metal which conducts electric current.

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