A neutral atom of fluorine has an atomic number of 9 and a mass number of 19. How many neu… — Armed Services Vocational Aptitude Battery (ASVAB)

A neutral atom of fluorine has an atomic number of $9$ and a mass number of $19$ . How many neutrons are contained in the nucleus of this atom?

The nucleus contains

10

neutrons.

The mass number (

A = 19

) is the total number of protons and neutrons in the nucleus. The atomic number (

Z = 9

) represents the number of protons. The number of neutrons is determined by subtracting the atomic number from the mass number:

19 - 9 = 10

Identify the given atomic number and mass number.

Atomic number (

Z

) =

9

, Mass number (

A

) =

19

The atomic number indicates the number of protons, while the mass number represents the sum of protons and neutrons.

Apply the subatomic particle calculation formula:

\text{Number of Neutrons} = \text{Mass Number} (A) - \text{Atomic Number} (Z)

19 - 9 = 10

Subtracting the number of protons from the total nucleon count yields the number of neutrons.

Subatomic particle calculation using atomic number and mass number

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