Concept13 - Concept 2.3 The formation and function of...

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Concept 2.3 The formation and function of molecules depend on chemical bonding between atoms Atoms with incomplete valence shells can interact with each other by sharing or  transferring valence electrons. These interactions typically result in the atoms remaining close together, held by attractions  called  chemical bonds. The strongest chemical bonds are covalent bonds and ionic bonds. covalent bond  is formed by the sharing of a pair of valence electrons by two atoms. If two atoms come close enough that their unshared orbitals overlap, they will share their  newly paired electrons. Each atom can count both electrons toward its goal of filling the  valence shell. For example, if two hydrogen atoms come close enough that their 1s orbitals overlap, then  they can share a pair of electrons, with each atom contributing one. Two or more atoms held together by covalent bonds constitute a  molecule. We can abbreviate the structure of the molecule by substituting a line for each pair of  shared electrons, drawing the  structural formula. H—H is the structural formula for the covalent bond between two hydrogen atoms. The  molecular formula  indicates the number and types of atoms present in a single  molecule. H
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Concept13 - Concept 2.3 The formation and function of...

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