A Lewis structure is a two-dimensional representation of a molecule that does not necessarily show what shape that molecule would take in three dimensions. Based on the Lewis structure and your knowledge of VSEPR theory, approximate the smallest bond angle in this molecule. ..
xyx
..

The smallest bond angle in the molecule x-y-x is

Explanation:

According to VSEPR theory , each atom in a molecule will achieve a geometry that minimizes the repulsion between electrons in the valence shell of that atom.

In the given compound , the number of electron pairs is 2 that means the hybridization will be  and geometry of the molecule will be linear as there are two bond pairs .The bond angle for linear geometry is 180° which reduces the electron electron repulsions and maximise stability.

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water pollution kills aquatic life. aquatic life includes algae and other plant life that use photosynthesis. photosynthesis takes   c02 out of the air.  

c02is a greenhouse gas.

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.