Final answer:
The formula for the compound formed from calcium (Ca) and nitrogen (N) using the Lewis model is Ca3N2. This is derived by balancing the ionic charges of Ca2+ and N3- with the crisscross method, leading to three calcium ions for every two nitrogen ions to achieve an electrically neutral compound.
Step-by-step explanation:
To determine the formula for the compound that forms from calcium (Ca) and nitrogen (N) using the Lewis model, we'll start by looking at the charges of the ions. Calcium forms a Ca2+ ion, while nitrogen forms an N3- ion. To achieve a neutral compound, the total positive charge must balance the total negative charge. Using the crisscross method, the positive charge of calcium being 2+ and the negative charge of nitrogen being 3- would lead us to a formula of Ca3N2.
This chemical formula indicates that three calcium ions are needed to balance the charge of two nitrogen ions, creating an electrically neutral compound. It is important to remember that the subscripts in a chemical formula indicate the number of atoms of each element present in one unit of the compound.