In Which of the Following Atoms Is the 2s Orbital

question 53

Multiple Choice

In which of the following atoms is the 2s orbital closest to the nucleus?

• A) Si
• B) S
• C) P
• D) Cl
• E) The 2s orbitals are the same distance from the nucleus in all of these atoms.

---

Definitions:

Peptide Structure

The sequence and chemical bonding of amino acids in a peptide, which dictates its three-dimensional shape and function.

Phenylthiohydantoin

An aromatic compound derived from the reaction of amino acids with phenylisothiocyanate, used in sequencing peptides.

Phenylisothiocyanate

An organic compound used in the Edman degradation method for sequencing amino acids in peptides.

Bradykinin

A peptide that causes blood vessels to dilate (enlarge), resulting in a drop in blood pressure and increased pain sensitivity.