how to tell if an amino acid can form a hydrogen bond with another amino acid to stabilize the secondary structure of a pleated sheet

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.

the answer is a! (2.9 x 10^-18 j) hope i could someone. : )

5.6⋅10−^19  j

do you need the explaination?