An isotope has an atomic number of 8 and an atomic mass number of 18. How many neutrons does it have?

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21-09-2017
Biology

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An isotope has an atomic number of 8 and an atomic mass number of 18. How many neutrons does it have?

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227vn7sm 227vn7sm · Answer 1 · 2017-09-21T18:32:54+02:00

The atomic number of an isotope is the number of protons it contains, whereas the mass number is the total mass of the nucleus, which is the combined number of protons and neutrons in the nucleus. To find the number of neutrons, you must therefore subtract the atomic number of the isotope from the mass number of the isotope.
In the above example, the atomic number is 8 and the mass number is 18. This isotope is known as O18. The number of neutrons in the isotope is: Mass number - Atomic number = Number of neutrons

lhmarianateixeira lhmarianateixeira · Answer 2 · 2022-03-17T14:21:37+01:00

In this exercise we have to use the knowledge of isotopes to determine how many neutrals it has, as well as:

This isotope have 10 neutrons.

What is an isotope?

These are atoms of the same chemical element that have the same number of protons (same atomic number), but differ by mass number (A = protons + neutrons). Their mass number is different because the number of neutrons in the nucleus is different.

Then we can write as:

Mass number - Atomic number = Number of neutrons

Putting the given values in the statement we have:

[tex]18-8=10[/tex]

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