Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions: Ca2+,Fe2+,I-,O2-

yes it is balanced

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?