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?

Answer 1

This isotope of fluorine has 9 protons, 9 electrons and 10 neutrons.

The atomic number is the number of protons #("p"^+")#. In a neutral atom, the number of electrons #("e"^(-)")# equals the number of protons. Mass number 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 10 neutrons, 9 electrons, and 9 protons.

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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Answer 2

Olivia Anton

Nine protons, ten neutrons, and nine electrons make up the atom with an atomic number of nine and an atomic mass number of nineteen.

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Answer from HIX Tutor

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.