Question

Electronic configuration of an atom is $2,8,7$.
To which of the following elements, would it be chemically similar?

• A. Nitrogen $(Z=7)$
• B. Fluorine $(Z=9)$
• C. Phosphorus $(Z=15)$
• D. Argon $(Z=18)$

Answer 1

Answer: (B)

Fluorine $(Z=9)$

It will be chemically similar to flourine. The atomic number of $F$ is $9$ with the electronic configuration (2,7). The given element and $F$ has the same number of electrons in the valence shell hence they belong to the same group and show similarity in the chemical properties.