Attached to this answer is the format of Isotope Notation that you can use for future reference. <em>(Please open)</em>
There are
8 Protons. The Atomic Number is the same number of an element's proton.
If you can see in the format, the mass number is calculated by adding the atomic number/protons and neutrons.
Mass number = 8 + 11Mass number = 19The image of the final answer is attached as well.
'alcohol'<span>The most commonly used and abused substance in terms of prevalence and recency of use.</span>
<span>Democritus believed that matter is made up of tiny individual particles known as </span>Atoms
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