Write Lewis structures for:(a) PO43−(b) ICl4−(c) SO32−(d) HONO

Draw a Lewis electron-dot symbol for (a) As; (b) Se; (c) Ga.

How many resonance structures, if any, can be drawn for the nitrate ion (NO3-)? (a) 1 (no resonance) (b) 2 (c) 3 (d) 4

Three main group elements, X, Y and Z, from three different groups inthe Periodic Table, each form a neutral trifluoride, i.e. XF3, YF3 andZF3. (a) To which three groups of the Periodic Table could the elementsX, Y and Z belong? Are any of these atoms X, Y or Zhypervalent in the trifluorides formed? (b) Use VSEPR theory to deduce the shapes of the molecules XF3,YF3 and ZF3, showing full working, and sketch these shapes (c) Only two of the three trifluorides have a non-zero dipole moment.For these molecules to which groups of the Periodic Table do thecentral atoms belong?