$(a)$ Compare metals and non-metals based on their physical properties. (any four points)
$(b)$ What are metalloids? Give two examples.
$(c)$ Identify metals from the following: Boron,sodium,mercury,carbon.
$(b)$ What are metalloids? Give two examples.
$(c)$ Identify metals from the following: Boron,sodium,mercury,carbon.
(C) Comparison between metals and non-metals:
$(b)$ Elements that exhibit properties intermediate between those of metals and non-metals are called metalloids. Examples: Boron $(B)$ and Silicon $(Si)$.
$(c)$ Among the given elements,sodium $(Na)$ and mercury $(Hg)$ are metals.
| Metals | Non-metals |
|---|---|
| $(1)$ Metals are malleable and ductile. | $(1)$ Non-metals are brittle. |
| $(2)$ Metals are sonorous,i.e.,they produce a ringing sound when struck. | $(2)$ Non-metals are not sonorous. |
| $(3)$ Metals are good conductors of heat and electricity. | $(3)$ Non-metals are poor conductors of heat and electricity (except diamond and graphite). |
| $(4)$ Metals are generally solids at room temperature (except mercury). | $(4)$ Non-metals can be solids,liquids,or gases at room temperature. |
$(b)$ Elements that exhibit properties intermediate between those of metals and non-metals are called metalloids. Examples: Boron $(B)$ and Silicon $(Si)$.
$(c)$ Among the given elements,sodium $(Na)$ and mercury $(Hg)$ are metals.
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