Naturally occurring proteins consist exclusively of L-amino acids. Below is the structure of a peptide Ala-Pro-Cis. Which of these amino acids have been drawn as L-amino acids? Ala and Pro

Pro and Cis

Ala, Pro and Cis

Ala and Cis

the electron configuration that you gave me has 16 electrons ergo it has 16 protons ergo it is the element sulfur.

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.

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.