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Is -1.9 a natural number

Updated: 9/21/2023
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8y ago

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Yes, 19 is a natural number

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No.

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Yes, it is.

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Q: Is -1.9 a natural number
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Fluorine's atomic number is 9 and its atomic mass is 19. How many neutrons does fluorine have?

Answer is in the question itself. 19. Because atomic mass is nearly equal to the mass number of the atom. Mass number is always a round number that is natural number. The proton code for fluorine atom is 9. Mass number is the total number of protons and neutrons. So for mass number 19, the number of neutrons will be 19 - 9 = 10.


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The atomic number by definition is the number of protons in the nucleus, therefore 19 in this instance. (The isotope effectively specified by the numbers given in the question is potassium-40, which is least commonly occurring natural isotope of potassium.)


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What is the atomic number and mass number for potassium?

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Is 19 a prim number or a composite number?

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