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 have one lone pair of electrons. b. atoms must be electronegative. c. atoms must be small. d. atoms must not be able to closely approach the hydrogen.

 C. atoms must be small.

Explanation:  Hydrogen bond is the result of the electrostatic forces of attraction between the hydrogen and the electonegative atom. It is a type of dipole dipole interaction which is not so much of a covalent bond.

The options A, B and D satisfies the definition of the hydrogen bonding but the option C seems to be irrelevant as hydrogen bonding does not deal with the size of the atom.

Thus for the hydrogen bonding , the other atom must be electronegative, and atoms must have atleast one lone pair of electrons and atoms must not be able to closely approach the hydrogen.

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