show dot and cross structure of any five compound from group 2 and group 6
Answers
Answer:
Lewis Dot Symbols and Lewis Structures
Representing Valence Electrons in Lewis Symbols
Lewis symbols use dots to visually represent the valence electrons of an atom.
LEARNING OBJECTIVES
Recall the Lewis structure formalism for representing valance electrons
KEY TAKEAWAYS
Key Points
Electrons exist outside of an atom ‘s nucleus and are found in principal energy levels that contain only up to a specific number of electrons.
The outermost principal energy level that contains electrons is called the valence level and contains valence electrons.
Lewis symbols are diagrams that show the number of valence electrons of a particular element with dots that represent lone pairs.
Lewis symbols do not visualize the electrons in the inner principal energy levels.
Key Terms
principal energy levels: The different levels where electrons can be found and that occur at specific distances from the atom’s nucleus. Each level is associated with a particular energy value that electrons within it have.
valence level: The outermost principal energy level, which is the level furthest away from the nucleus that still contains electrons.
valence electrons: The electrons of atoms that participate in the formation of chemical bonds.
Lewis symbols: Symbols of the elements with their number of valence electrons represented as dots
Lewis symbols (also known as Lewis dot diagrams or electron dot diagrams) are diagrams that represent the valence electrons of an atom. Lewis structures (also known as Lewis dot structures or electron dot structures) are diagrams that represent the valence electrons of atoms within a molecule. These Lewis symbols and Lewis structures help visualize the valence electrons of atoms and molecules, whether they exist as lone pairs or within bonds.
Principal Energy Levels
An atom consists of a positively charged nucleus and negatively charged electrons. The electrostatic attraction between them keeps electrons ‘bound’ to the nucleus so they stay within a certain distance of it. Careful investigations have shown that not all electrons within an atom have the same average position or energy. We say the electrons ‘reside’ in different principal energy levels, and these levels exist at different radii from the nucleus and have rules regarding how many electrons they can accommodate.

Principal energy levels of gold (Au): The figure shows the organization of the electrons around the nucleus of a gold (Au) atom. Notice that the first energy level (closest to the nucleus) can have only two electrons, while more electrons can ‘fit’ within a given level further out. The number of electrons in each level is listed on the upper right corner of the figure. Notice that the outermost level has only one electron.