These are not able to conduct electricity or heat very well, very brittle (breakable), and cannot be made into wires or pounded into sheets

Nonmetals

Explanation:

Nonmetals typically lacks the metallic bonding which allows substances to exhibit metallic properties that confers special properties on them.

Nonmetals lacks these properties but metalloids are able to show some of the properties under certain and special conditions.

answersilicon (si); oxygen (o);