1. What is the Mass Number for Fluorine (F)?

Definition: The mass number of fluorine is 19 atomic mass units (amu).

Explanation: This value represents the sum of protons and neutrons in the nucleus of a fluorine atom.

2. Fluorine Atomic Structure

Fluorine (F) has:

• Atomic number: 9 (number of protons)
• Most common isotope: Fluorine-19
• Number of neutrons: 10 (in F-19 isotope)
• Electrons: 9 (in neutral atom)

3. Importance of Mass Number

Details: The mass number helps identify isotopes and is crucial for chemical calculations and nuclear physics.

4. Fluorine Characteristics

Properties:

• Highly reactive pale yellow gas
• Most electronegative element
• Belongs to the halogen group
• Essential for dental health (fluoride compounds)

5. Frequently Asked Questions (FAQ)

Q1: Why is fluorine's mass number 19?
A: The most stable and abundant isotope of fluorine contains 9 protons and 10 neutrons (9 + 10 = 19).

Q2: Are there other fluorine isotopes?
A: Yes, but Fluorine-19 makes up 100% of naturally occurring fluorine. Fluorine-18 exists but is radioactive.

Q3: How does mass number differ from atomic weight?
A: Mass number is specific to an isotope (whole number), while atomic weight is the weighted average of all naturally occurring isotopes.

Q4: Why is fluorine so reactive?
A: Its high electronegativity and small atomic size make it strongly attract electrons from other elements.

Q5: Where is fluorine commonly found?
A: In minerals like fluorite (CaF₂), in drinking water (as fluoride), and in Teflon (PTFE) products.