The requirements of atoms to be able to participate in hydrogen bonding with a hydrogen atom include all of the following except a. atoms must not be able to closely approach the hydrogen. b. atoms must be electronegative. c. atoms must have one lone pair of electrons. d. atoms must be small.

B. atoms must be electro negative.

The answer is A.

Explanation:

This is a specific type of polar interaction that is established between two atoms with high electronegativity, usually between O or N, and an atom of H. In the case of oxygen, with a total of 8 electrons, two pairs of solitary electrons are presented and can act as acceptors of two hydrogen bridges. Nitrogen has one less electron and therefore has only one pair of solitary electrons to form a hydrogen bridge. These orbitals have a high negative charge density, and can, therefore, bind to the positive charge of hydrogen.

The interatomic distance between the hydrogen and the acceptor is less than the sum of its Van der Waals radius. The atomic radius of N and O are relatively small.

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the answer is symmetrical : )