Place the atoms relative to each other. place the atom with group number in the center because it has the electronegativity. of atoms have the same group number, place the atom with the period number in the center.

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? ?

bcde is the incorrect answer it is a