Anegative pka value indicates which of the following? a weak base (b. strong base weak acid d strong acid

The correct option is: D. Strong acid

Explanation:

The acid dissociation constant, also called the acid-ionization constant, is the strength of a given acid in a solution. It is a quantitative property which is denoted by the symbol Ka.

The negative logarithm of the acid dissociation constant i.e. the Ka value is equal to pKa.

pKa = -log Ka, where pKa and Ka are inversely proportional.

Therefore, for a strong acid, the acid dissociation constant, Ka is very large positive value and pKa is a negative value (pKa < 0).  

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