Answer is: nonmetals.
Nonmetals are far right at Periodic table, except hydrogen (H).
The nonmetals are divided into two categories: reactive nonmetals and noble gases.
The type of bond in nonmetal is covalent bond, there is no free electrons, so they do not conduct heat.
Intermolecular forces are weak, so they have low boiling points.
Nonmetals have low electrical and thermal conductivity .
