describe the structure of a covalent molecular substance and describe the structure of a covalent network substance?​

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

Although respiratory organs vary across different organisms, they all contain respiratory surfaces that have a large surface area and are extremely thin. explain why having an extremely thin respiratory surface with a large surface area is advantageous for the process of gas exchange

In the following table, all the columns for the element calcium are filled out correctly. element electron structure of atom electron structure of ion net ionic charge calcium 1s22s22p63s23p64s2 1s32s22p63s23p64s1 +1 true false