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Question

Atomic numbers of nitrogen, oxygen and fluorine are 7, 8 and 9 respectively. Write the electronic configuration of each element and answer the following question:

What is the number of valence electrons of F?


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Solution

Step-1: Introduction

The elements in periodic table are placed in periods and groups. Periods are horizontal rows that has increasing atomic numbers. Groups are vertical columns. There are 7 periods and 18 groups in periodic table.

Step-2: Electronic configuration

Atomic numbers of Nitrogen (N), Oxygen (O) and Fluorine (F) are 7, 8 and 9 respectively.

Electronic configuration of Nitrogen = (2, 5)

Electronic configuration of Oxygen = (2, 6)

Electronic configuration of Fluorine = (2, 7)

Step-3: Valence electrons of Fluorine

The electrons in the valence shell of the element is valence electrons.

Fluorine has 2 electrons in K-shell and 7 electrons in L-shell. Since L-shell is valence shell, it has 7 valence electrons.

Therefore, the number of valence electrons in Fluorine is 7.


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