Given a formula of a functional group: An organic compound that has this functional group is classified as 1) an organic acid 2) an ester 3) a ketone 4) an aldehyde

Since the formula of the functional group is not given in the question, here are possible answers; If it is;

1. -COOH or -CO2H, it is an organic acid

2. -COOR, it is an ester

3. RC=O, it is a ketone

4. HC=O, it is an aldehyde

Note: Check the attachment below

Explanation:

The functional group of an organic compound is a specific group of atoms or bonds within a compound that is responsible for the characteristic chemical reactions of that compound.

The most common functional groups are:

Carbonyls (C=O); which includes the aldehydes, HC=O, and ketones, RC=O

Alcohols (-OH),

Carboxylic (organic) acids (COOH),

Edters (COOR), and

Amines (NH2).

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