Question

all non metals are ductile or not

Answer 1

Ductility is a measure of a material's ability to undergo significant plastic deformation before rupture, which may be expressed as percent elongation or percent area reduction from a tensile test.

Malleability , a similar property, is a material's ability to deform under compressive stress; this is often characterized by the material's ability to form a thin sheet by hammering or rolling.

Soft metals like Pottasium & Sodium are niether ductile nor malleable, so as liquid metal Mercury. Again brittle metals are niether of the two like Cast Iron(general one). Gold is the most ductile & malleable of all know metals. Again Lead is a metal which is malleable but not ductile.

Hope it will help you