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All atoms of the element potassium have 19 protons. One of the most stable types of potassium atoms has the mass number 39. How many neutrons make up one of these potassium atoms?
A. 19
B. 29
C. 38
D. 58

Respuesta :

taskmasters
For atoms in the periodic table, the given mass number is the sum of the number of the protons (also called the atomic number) and the number of the neutrons inside its nucleus. Mathematically,
                              mass number = atomic number + number of neutrons
Substituting,
                               39 = 19  + n
                                    n = 39 - 19 = 20
Therefore, the answer is not found in the choices. 
mickymike92

Based on the mass number of the atom,  there are 20 neutrons in the atom of potassium with a mass number of 39.

What is the mass number of an atom of an element?

The mass number of an atom of an element is the sum of the protons and neutrons present in the nucleus of the atom.

  • Mass number = proton number + neutron number

Therefore;

  • Neutron number = mass number - proton number.

The neutron number of the atom is:

Neutron number = 39 - 19 = 20.

Therefore, there are 20 neutrons in the atom of potassium with a mass number of 39.

Learn more about mass number at: https://brainly.com/question/295273

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