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.

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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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the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.

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