Question: (a) Methane (CH4) and the perchlorate ion are both described as tetrahedral. What does this indicate about their bond angles? (b) The NH3 molecule is

(a) Methane (CH4) and the perchlorate ion are both described as tetrahedral. What does this indicate about their bond angles?
(b) The NH3 molecule is trigonal pyramidal, while BF3 is trigonal planar. Which of these molecules is flat?

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