A nucleus controls all the activities of the cell including cell repair. It is made up of chromosomes which are made up of DNA(deoxyribonucleic acid)and proteins. Genes are part of nucleus which store information to be passed down from one generation to another.
Metalloids are the materials which are made up of both metals and non-metals and are just like alloys(I think :P). Non-metals are not reactive, have low boiling and melting points, are non-ductile,non-sonorous and are poor conductor of heat and electricity while metals have the opposite properties of non-metals. Hope this helps :)