1. Taking into account the existence of any lone pairs of electrons, what is the approximate geometry of electron groups surrounding the central Cl atom in the perchlorate ion (ClO4-)?
2. Taking into account the existence of any lone pairs of electrons, what is the approximate geometry of electron groups surrounding the central I atom in ICl4- molecular anion?
3. Taking into account the existence of any lone pairs of electrons, what is the approximate geometry of electron groups surrounding the central Kr atom in KrF2?