How does the reactivity of nonmetals change as you move from left to right across the periodic table?

Covalent network solids typically have melting points and boiling points. the chemical formula of a network solid indicates in the molecule.

The crust of earth may a- continets and ocean floors. b-continents only. c-layers of sedimentary rocks and continents. d-all of the above

Which statement is true about the part of the electromagnetic spectrum that human eyes can detect? it contains only the colors of the rainbow and television waves. o it is divided into seven ranges of wavelengths. it contains ultraviolet, visible, and infrared light. it is divided into nine ranges of wavelengths.