Question

Which statement about an atom of fluorine, 19 F 9 , is correct?

Answer 1

Answer:

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Explanation:

10 neutrons

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

Answer 2

The correct statement about an atom of fluorine, 19 F 9, is that it contains a total of 28 protons, electrons and neutrons.

• In 19 F 9, F stands for fluorine which is a chemical element and 9 stands for atomic number i.e its atomic number is 9.
• An atomic number of any chemical atom is the same as the number of protons present in that element.
• So, the number of protons of F (fluorine) = 9.
• There are generally numerous types of isotopes for stable elements.
• Isotopes are defined as nuclides that include the same number of protons and electrons i.e same atomic number but their mass number differs because the number of neutrons also differs.
• Here, 19 denotes that it Fluorine-19 isotope that has a mass number of 19.
• Now, mass number - number of protons (atomic number) = number of neutrons.
• So, the number of neutrons is 10.
• Now, number of neutrons + number of protons + number of electrons = 10 + 9 + 9 = 28.

Hence, 28 is the total sum of the number of neutrons, electrons and protons present in 19 F 9.