Tag: non-metals

Generally all the metals are found in the solid state at room temperature. The exception to this is mercury. Mercury is found in liquid state at room temperature. Whereas non metals are found in the 3 states at room temperature $i.e.$ solid, liquid and gas.

Sodium is an alkali metal and is highly reactive, reacting vigorously with cold water to produce hydrogen gas and sodium hydroxide.

The most electrically conductive element is silver, followed by copper and gold. Silver also has the highest thermal conductivity of any element and the highest light reflectance.  Because silver tarnishes, it is less desirable for high frequencies because the exterior surface is less conductive.
As to why silver is the best conductor, the answer is that its electrons are freer to move than those of the other elements. This has to do with its valence and crystal structure.

Aluminium is the most abundant metal in earth's crust with $\text{percentage by weight = 8.23%}$ followed by iron with $\text{5.63% by weight }$.

The most abundant element in earth's crust is oxygen with$\text{ Percent by weight = 46.1% followed by aluminium with 8.23% by weight.}$
Hence, the answer is option $B$.

Ans: (B) False

Ans : (D) Sand and Shirt

Metals exists as solids at room temperature but Gallium and mercury are  liquid metals.
They Exists as liquids at room temparature.
Hence option C is correct.

The density of non metals isl ow when compared with  metals as metals are solids and non metals are liquids and gases(Generally solids are more denser than liquids and gases).
Hence option C is correct.