Why physical and chemical properties are found among the nonmetals?

Because the elements they tend to gain electrons to form anions during chemical reactions, they are electronegative elements with high ionization energies, so they are non-lustrous, brittle and poor conductors of heat and electricity. They cannot react to water as its their chemical property due to being unable to break the bond between H and O in water. The non-metals cannot reduce hydrogen by donating electrons.

the answer is the