Fluorine's atomic number is 9 and its mass number is 19. How many neutrons does fluorine have?

Step 1: Define the Problem

Identify the number of neutrons in a fluorine atom given its atomic number and mass number.

Step 2: Break Down the Problem

• Atomic Number: Represents the number of protons in an atom.
• Mass Number: Represents the total number of protons and neutrons in an atom.

Step 3: Apply Relevant Concepts

• The formula to find the number of neutrons is: $\text{Number of Neutrons} = \text{Mass Number} - \text{Atomic Number}$

Step 4: Analysis, Verify and Summarize

• Given:
  • Atomic Number of Fluorine = 9
  • Mass Number of Fluorine = 19
• Calculation: $\text{Number of Neutrons} = 19 - 9 = 10$

Final Answer

Fluorine has 10 neutrons.