Arrange these elements according to atomic radius. Sr, Ba, Be, Ca, Mg
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Trigonal pyramidal has 1 lone pairs and 3 bonds so it is D. PH3
Work: You have to calculate amount of valence electrons for each molecule by looking at the group number and skipping the transition metals. Then you make your Lewis dot structure and see which fits the correct shape. Looking up a molecular geometry chart can help.
Work: You have to calculate amount of valence electrons for each molecule by looking at the group number and skipping the transition metals. Then you make your Lewis dot structure and see which fits the correct shape. Looking up a molecular geometry chart can help.