How many neutrons in the #""^56Fe# isotope?

Answer 1

#""^56Fe# has 30 neutrons.

How did I know this? Well, an iron atom has 26 protons, positively charged, massive nuclear particles. The number defines #Z#, the atomic number; #Z=1, H#; #Z=2, He#; #Z=3, Li#;...........#Z=26, Fe#.............

The nucleus also contains neutrons, massive, neutrally charged particles, and to a first approximation, the sum of protons and neutrons gives tha mass of the isotope. So if the question mentions iron, I know that #Z=26#; it is thus simple to specify the isotopic mass if the number of neutrons is given.

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Answer 2

Wyatt Adkins

The (^{56}\text{Fe}) isotope contains 30 neutrons.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.