Final answer:
The presence of ml quantum number affects the existence of certain orbitals within atoms, impacting the atoms' electron configurations. Without the ml quantum number, Calcium (Ca) would not be among the univalent atoms based on the given options.
Explanation:
The ml quantum number specifies the orientation of orbitals in an atom. If there were no ml quantum number, certain orbitals would not exist. For example, d orbitals in the third and higher energy levels would not be present.
Out of the options given, Calcium (Ca) would not be among the univalent atoms if there were no ml quantum number, as it requires d orbitals for its electron configuration.
Therefore, Calcium (Ca) (option D) won't be among the four univalent atoms in this scenario.
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