What is the central atom of H2O?

Water has 4 regions of electron density around the central oxygen atom (2 bonds and 2 lone pairs). These are arranged in a tetrahedral shape. The resulting molecular shape is bent with an H-O-H angle of 104.5°.

Explanation:

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c (diamond),

sio2 (quartz)

answer; the numbers of valence electrons in the acetic acid molecule (ch3co2h) is 24;