Based on your understanding of the periodic table, which list contains only nonmetals?
a) f, cl, i, s
b) al, si, p, s
c) na, cl, s, si
d) he, h, as, sb

A) F, Cl, I, S

they are non metals because they don't conduct electricity.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called