Chapter 5.3, Problem 33SSC

Interpretation Introduction

Interpretation:

The correct electron dot structure for an atom of Selenium needs to be identified from the given options.

Concept introduction Electron dot structure for an atom is the structure which denotes the valence electrons around the elements. The electrons are represented as dots in the structure.

Answer to Problem 33SSC

The electron configuration of Selenium is $\left[Ar\right]3d^{10}4s^{2}4p^4$

This shows that Selenium has six valence electrons valence shell $(4s²4p⁴).$

Therefore option C is correct.

Explanation of Solution

Reason for correct option: Electron dot structure for an atom is a representation of the valence shell electrons in an atom. It represents the arrangement of atoms in the molecules. The stable electronic configuration is the one where octet rule is followed. The neutral atom of an element other than noble gases has incomplete octet.

The electron configuration of Selenium is $\left[Ar\right]3d^{10}4s^{2}4p^4$

This shows that Selenium has six valence electrons valence shell $(4s²4p⁴).$

Thus, there must be 6 dots around the symbol of an atom.

Therefore option C is correct.

Conclusion

Reason for incorrect option:

1. In this option, there are 7 electrons around the symbol of Se but it has 6 valence electrons thus, this is incorrect option.
2. In this symbol, there are three dots represented together which is not correct. The valence electrons are represented around symbol either single or in pair. Thus, this is incorrect option.
3. The incorrect symbol of Se is taken thus, it is incorrect option.