Question

At room temperature liquid metals and liquid non metals are :
$\left( A \right)Hg$ and ${I_2}$
$\left( B \right)Cs$ and $C{l_2}$
$\left( C \right)Hg$ and $B{r_2}$
$\left( D \right)Cd$ and $S$

Answer 1

Hint : Metals are those which have properties like hardness , electric conductor ,ductility and malleability . Non- metals lack these qualities . We have to tell the metal and non metal which are liquid at room temperature. Now for solving this we first know the room temperature is equal to $298k$ .

Complete step by step answer
Room temperature is ${25^ \circ }C$ or $298k$ . If we see options then caesium and cadmium both are solid at room temperature . So the options $\left( b \right)$ and $\left( d \right)$ both are not correct .
Now we know that iodine, which is a non-metal, is solid at room temperature , so the option $\left( a \right)$ will not be correct .
So the metal mercury and non metal bromine are liquid at room temperature, so the option $\left( c \right)$ is correct .
Additional information: There are other elements present which are liquid melt in temperature slightly higher than room temperature .
Those elements are francium which is a radioactive substance which has a melting point $300K$ .
Caesium atomic number is $55$ , which melts at $301.59K$ . It is very soft metal and reacts with water violently .
Gallium which is also a soft metal which melts at $303.5K$ , it can melt in the body temperature .
Gallium is used in laborers as it is considered less toxic .
Rubidium whose atomic number is $312.4K$ . It is a soft , silvery metal having melting point
It generally gets ignited and forms rubidium oxide .

Note :
Metal atoms lose their electrons to be a cation and non metal accept electrons and become anion . metal oxides are basic in nature and non metal forms acidic oxides . All metals are solid at room temperature except mercury.