Suggest identify of a convalent compound with a higher melting point than licl

As you move from right to left on the periodic table the atomic radius fill in the blank

Explanation for basic character?

Give the set of reactants (including an alkyl halide and a nucleophile) that could be used to synthesize the following ether: draw the molecules on the canvas by choosing buttons from the tools (for bonds and charges), atoms, and templates toolbars, including charges where needed. ch3ch2och2ch2chch3 | ch3