We have to explain how the H–X–H bond angle varies in the series H2O, H2S, H2Se.
Oxygen, sulfur and selenium all belong to the 6A group of the periodic table. We will follow these steps to solve this problem:
Step 1: Draw a generic Lewis structure for a group 6A element.
Step 2: Explain the trend of electronegativity for O, S and Se.
Step 3: Link bond angles to the drawn structure.
How would you expect the H - X - H bond angle to vary in the series H2O, H2S, H2Se ? (Hint: The size of an electron pair domain depends in part on the electronegativity of the central atom.)
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