If an atom has an atomic number of 9 and an atomic mass number of 19, how many protons, neutrons, and electrons does it have?

Md Ariful Islam

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The is the number of protons $("p"^+")$. In a neutral atom, the number of electrons $("e"^(-)")$ equals the number of protons. is the sum of the protons and neutrons $("n"^0")$ of a particular isotope. If you have mass number and atomic number, subtract the atomic number from the mass number to get the number of neutrons. $("Mass number") - ("atomic number")="number of neutrons"$.

There are:
9 protons
9 electrons
10 neutrons

Fluorine is the element in question, as its atomic number is $9$. You would name this particular isotope using the mass number. It would be called fluorine-19.

The nuclear or isotopic notation would be $""_9^19"F"$.

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