Atomic orbitals undergo hybridization, which results in new orbital forms and spatial orientations.
In the localized valence bond theory, a mathematical method known as hybridization is used to construct sets of equivalent orbitals that are correctly orientated to form bonds from atomic orbitals that are similar in energy but not equivalent. Because they are created by combining (hybridizing) two or more atomic orbitals from the same atom, these new combinations are known as hybrid atomic orbitals.
By combining the beryllium 2s orbital with any of the three degenerate 2p orbitals in BeH2, we can create two equivalent orbitals.
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