Using Lewis symbols and Lewis structures, make a sketch of the formation of NCl3 from N and Cl atoms, showing valence-shell electrons. (e) How many lone pairs of electrons are in the NCl3 molecule?

Verified step by step guidance

1. Draw the Lewis symbols for a nitrogen (N) atom and a chlorine (Cl) atom. Nitrogen has 5 valence electrons, and chlorine has 7 valence electrons.
2. Identify the number of electrons needed for each atom to achieve a full octet. Nitrogen needs 3 more electrons, and chlorine needs 1 more electron.
3. Sketch the Lewis structure for NCl3 by placing the nitrogen atom in the center and arranging three chlorine atoms around it. Each chlorine atom will share one electron with nitrogen, forming a single covalent bond.
4. Complete the octet for each chlorine atom by adding the remaining lone pairs of electrons around them. Each chlorine atom should have three lone pairs.
5. Count the lone pairs of electrons on the nitrogen atom. After forming three covalent bonds with chlorine atoms, nitrogen will have one lone pair of electrons.

Key Concepts

Lewis Symbols

Lewis symbols represent the valence electrons of an atom as dots surrounding the element's symbol. Each dot corresponds to a valence electron, allowing for a visual representation of how atoms bond and share electrons. This concept is fundamental in predicting how atoms will interact in chemical reactions, particularly in covalent bonding.

Lewis Structures

Lewis structures are diagrams that depict the arrangement of atoms and the distribution of valence electrons in a molecule. They illustrate how atoms are bonded together and show lone pairs of electrons that are not involved in bonding. Understanding Lewis structures is essential for visualizing molecular geometry and predicting the properties of compounds.

Lone Pairs

Lone pairs are pairs of valence electrons that are not shared with another atom and are localized on a single atom. In the context of molecular structures, lone pairs can influence the shape and reactivity of a molecule. For NCl3, recognizing the number of lone pairs on the nitrogen atom is crucial for understanding its molecular geometry and overall stability.