Please help me with my work

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

After watching the video "zinc strip in copper nitrate solution", and reading the instructions, click on the link labeled "start" just below the drawing of the pencil tip. follow the direction to complete the 3x3 grid. answer the below questions for the portion of the activity in which sn(s) is placed in agno3(aq)

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)