Three elements B, Si and Ge are
(a) metals
(b) non-metals
(c) metalloids
(d) metal, non-metal and metalloid respectively
Ans (c)
Sol
Boron is a chemical element with the symbol B and atomic number 5. It is a metalloid.
Silicon is a chemical element with the symbol Si and atomic number 14. It is a metalloid.
Germanium is a chemical element with the symbol Ge and atomic number 32. It is a metalloid.
Hence, Boron, Silicon and Germanium are metalloids which are placed diagonally in periodic table.
Hence option (c) is correct.