Question

fluorine has an atomic number 9. it is in period 2 of the periodic table. the diagram shows the electron dot diagram of a fluorine atom. how many valence electrons are in an atom of fluorine? two seven nine seventeen

Explanation:

Step1: Count dots in electron dot diagram

The diagram shows 7 dots around F.

Step2: Relate dots to valence electrons

Electron dot diagrams use dots to represent valence electrons.

Answer:

B. seven