Element X has two isotopes. X-15 has 7 protons and 8 neutrons. What is the atomic number and mass number of the second isotope, which has 10 neutrons in its nucleus?
The second isotope has an atomic number equal to
The most important thing to keep in mind here is that isotopes are atoms that have the same number of protons inside their nuclei.
In other words, an isotope is defined as an atom that shares the number of protons with at least one other atom but differs in the number of neutrons it has inside its nucleus.
Now, the name of the isotope is written using its mass number, which is simply the number of protons and neutrons located inside the nucleus.
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The second isotope of element X has an atomic number of 7, and a mass number of 17.
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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.
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.
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.
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.

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