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An atom of potassium with a mass number of 40 is known as K-40. Use the periodic table to determine how many neutrons are present in an atom of K-40. Type the correct answer in the box. Use numerals instead of words. One atom of K-40 has neutrons.

Respuesta :

Answer:21

Explanation:From Plato

Answer:

21

Explanation:

Neutral atoms of the same element always have the same number of protons and electrons. Only the neutron count changes with different isotopes. Potassium has 19 protons, so a K-40 atom has 21 neutrons (40 − 19 = 21).

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