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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