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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why is cellular respiration important for homeostasis?

it changes food into energy that the organism can use.

which of the following is most likely to happen if a cell is not able to divide?

the cell will not be replaced when it is damaged.

explanation:

your parents i think this could be it