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How many neutrons are in oxygen-18?

[tex]\[
\begin{array}{r}
18 \\
8
\end{array}
\][/tex]

A. 10
B. 18
C. 8

Sagot :

GinnyAnsweridn
Sure! The isotope notation given is for oxygen-18, written as:

[tex]\[ \begin{array}{c} 18 \\ 8 \end{array} \][/tex]

To determine the number of neutrons in this isotope, follow these steps:

1. Mass number (A): The mass number is the total number of protons and neutrons in the nucleus of the atom. For oxygen-18, the mass number is 18.

2. Atomic number (Z): The atomic number is the number of protons in the nucleus of the atom. For oxygen, the atomic number is 8 (since the element oxygen always has 8 protons).

3. Number of neutrons (N): To find the number of neutrons in the atom, subtract the atomic number from the mass number.

[tex]\[ \text{Number of neutrons} = \text{Mass number} - \text{Atomic number} \][/tex]

Now, plugging in the given values:

[tex]\[ \text{Number of neutrons} = 18 - 8 = 10 \][/tex]

So, the oxygen-18 isotope has 10 neutrons in its nucleus.
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