Question

Name the following:

$1$.A metal which is preserved in kerosene

$2.$A lustrous coloured non-metal

$3.$A metal which can melt while kept on a palm

$4.$A metal which is a poor conductor of heat

Answer 1

The metal which is preserved in kerosene :

• Sodium $\left(\mathrm{Na}\right)$ is known as a metal that is generally stored in kerosene.
• Also, there is another metal that can be stored in kerosene, which is potassium $\left(K\right)$.
• Sodium is known as a very highly reactive metal that generally reacts vigorously with oxygen $\left(O_2\right)$ .
• It can also react vigorously with Carbon dioxide$\left(C{O}_2\right)$ and moisture present in the air.
• Sodium reacts with these in such a way that causes a fire and hence it is kept in kerosene because making it non-reactive.

The lustrous colored non-metal:

• Iodine $\left(I_2\right)$ is known as a lustrous colored non-metal.
• Also, there exist another lustrous colored non-metal i.e Diamond.
• Iodine $\left(I_2\right)$ is said to be lustrous due to the reason that, when we go down the group size increases, and due to poor shielding effect there happens less interaction between atom and outermost electron, thus these electrons get excited by absorbing energy, and when they emit energy it appears that they have lustrous surface.

The metal which can melt while kept on a palm :

• Gallium $\left(Ga\right)$ or Cesium $\left(Cs\right)$ are known as the two metals which melt when kept on the palm.
• This happens due to the low melting point of Gallium, which makes it melt on our palm.

The metal which is a poor conductor of heat:

• Lead $\left(Pb\right)$ or mercury $\left(Hg\right)$ are known as the two metals that are poor conductors of heat.
• The reason for this is, that when Lead reacts with the atmosphere Oxygen it produces Lead oxide and metal oxides which are poor conductors of heat.