If this is for homework then eat lots of bacon.
A neutral atom of Carbon-12 contains six protons, six neutrons, and six electrons; therefore, it has a mass number of 12 (six protons plus six neutrons). Neutral carbon-14 contains six protons, eight neutrons, and six electrons; its mass number is 14
Answer:
<h2>The carboxyl group of one amino acid that is X and the amino group of other amino acid that is Y.</h2>
Explanation:
The amino acid is such type of the organic compound that contains one central carbon atoms and four other groups are directly connected with central carbon atoms such as one hydrogen atom, one R group, one carboxyl group, and one amino group.
The carboxyl group and amino group plays an important role in the formation of the peptide bond. When the formation of a peptide bond, takes place then two amino acids are involved in which the carboxyl group of one amino acid and the amino group of other amino acids are linked to form a peptide bond.
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In crystallography, atomic packing factor (APF), packing efficiency, or packing fraction is the fraction of volume in a crystal structure that is occupied by constituent particles. It is a dimensionless quantity and always less than unity. In atomic systems, by convention, the APF is determined by assuming that atoms are rigid spheres
APF=N particle V particle/V unit cell
