What is the mass number of an element that has 19 protons, 19 electrons, and 20 neutrons?

The mass number of the given element is 39.

The mass number can be described as the sum of the number of protons and neutrons in an atom. The mass number has also been known as the nucleon number. The mass number can be equivalent to the atomic mass of the element.

Mass number =  Number of neutrons + Number of protons

Given, protons = 19

Neutrons = 20

Mass number = 19 + 20

Mass number = 39

The mass number of the given element is 39.

For more information about the mass number, refer to the link:

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➷ 19 + 20 = 39

Mass number is the total of the protons and the neutrons

Therefore, the mass number is 39

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solute : a solute is a substance that is dissolved in another substance is known as a solvent. it is mixed with a special mixture know as homogeneous mixture.

solvent: a solvent is a substance that dissolved a solute, which results in a solution is known as solvent.

answer : (a) volume of the gas = 8.67 ×   l

                (b) second virial coefficient b = -1.21226 l/mole

solution :   given,     t = 300k

                                p = 20atm

                                z = 0.86

                                n = 8.2 mmoles = 8.2 × moles

                                r =   0.082 l atm/k/mol

        find,     (a) volume of gas   and (b) second virial coefficient b at 300k.

formula used :            

                          and            

(a)            

                    = \times 0.082\times 300}{20}[/tex]

                    = 8.67 ×   l

(b)      

                    = (0.00867-1) × 8.659

                    = - 8.5839 l/mole