Question

Name two non metals which are lustrous

Answer 1

Hint: Non metals are elements which lack the proper or characteristics of a metal. It is non lustrous in nature with only the exception of \[2\]. There are only \[2\] elements that are non metal but having a property of lustre

Complete step by step solution:
Lustre is basically a property of minerals that how well the mineral reflects light. The two non metals having lustre is Diamond and iodine.
In diamond due to conduction of heat, they are cold and are at room temperature. It has a great lustre. It exhibits great fire and brilliance which gives the shiny and freshly polished appearance.
Iodine: metals have lustre, are ductile and conductive of heat and electricity. iodine is a metalloid and not a non metal. Metalloids exhibit the properties of both metals and nonmetals. Hence iodine is both metal and non metal.

Additional Information:
screening effect or shielding effect occurs when the size of the nucleus the force of attraction on valence electrons. Because the presence of electrons in the inner shell is called a screening effect. Iodine has an atomic weight of \[53\]. It is fourth element in the seventeenth group and has seven electrons in their outer electrons

Note: Graphite is another non metal which is lustrous. It contains free electrons moving freely which causes reflection of light falling on them making it lustrous. As we move down the group more shells are added and there is an increase in size of the atom.