fluorine has an atomic number 9. it is in period 2 of the periodic table. the diagram shows the electron dot…

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

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

Answer

Explanation:

Step1: Recall electron - shell rules

Electrons fill shells in a specific order. The first shell can hold a maximum of 2 electrons, and the second shell can hold a maximum of 8 electrons.

Step2: Determine electron distribution for fluorine

Fluorine has an atomic number of 9, so it has 9 electrons. The first shell has 2 electrons, and the remaining 9 - 2=7 electrons are in the second (outer) shell.

Step3: Identify valence electrons

Valence electrons are the electrons in the outermost shell. For fluorine, the outermost shell has 7 electrons.

Answer:

B. seven