Calculate the pka value of the weakly basic aromatic amine in procaine from the data given below. Absorbance of a fixed concentration of procaine in 0.1M HCI at 296 nm = 0.031; absorbance in 0.1M NaOH = 1.363; absorbance in buffer at pH 2.6=0.837.​

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

a:

by the combination of an unlimited number of elements

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8