Molecular Configuration and Bonding The structural formula of water is often depicted as H-O-H, but this linear representation fails to capture the molecule's true three-dimensional geometry. However, oxygen also possesses two lone pairs of electrons that are not involved in bonding.
How Water Molecules Share Electrons in Their Bonds
Calculating the Total Valence Electrons The calculation of valence electrons in H2O is a straightforward application of periodic table principles. This uneven distribution of charge is what makes water a polar molecule, with a partial negative charge (δ-) near the oxygen and partial positive charges (δ+) near the hydrogen atoms.
Atomic Building Blocks: Oxygen and Hydrogen To determine the valence electrons in water, one must first examine the electronic structure of its constituent atoms. Oxygen, with an atomic number of 8, has an electron configuration of 1s² 2s² 2p⁴, placing six electrons in its outermost shell.
How Water Molecules Share Electrons in Their Bonds
This polarity is the root of water's remarkable solvent capabilities. These lone pairs are highly localized and create a region of high electron density.
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