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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.



Answer :

GinnyAnswer
To determine the number of neutrons in an atom of K-40, you need to look at the atomic number and mass number of potassium on the periodic table. The atomic number of potassium (K) is 19, which represents the number of protons in the nucleus of the atom. The mass number of K-40 is 40. To find the number of neutrons in an atom of K-40, you can subtract the atomic number from the mass number: Number of neutrons = Mass number - Atomic number Number of neutrons = 40 - 19 Number of neutrons = 21 Therefore, in an atom of K-40, there are 21 neutrons present.

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