On the basis of these models, determine in which drawing the substance is represented, the molecule of which: 1) contains an atom with a valence of IV. Write the name of this element; 2) is a simple substance, write the name of the element that forms it. Write the answers in the table.

Analysis of Models:

Let's analyze each model to determine the elements and their valences.

• Figure 1: This model depicts a molecule with two carbon atoms (represented by larger spheres) and four hydrogen atoms (smaller spheres). Each carbon atom is bonded to two hydrogen atoms and the other carbon atom. This is consistent with ethane (C₂H₆), where carbon has a valence of 4.
• Figure 2: This model shows a molecule with one chlorine atom (Cl) and one hydrogen atom (H). This represents hydrogen chloride (HCl), where both chlorine and hydrogen typically have a valence of 1.
• Figure 3: This model shows a molecule composed of four sulfur atoms (S) bonded together in a ring structure. This represents sulfur (S₈), a simple substance where sulfur has a valence of 2.

Table Completion:

Answer:

• The substance containing an atom with a valence of IV is represented in Figure 1. The element is Carbon.
• The simple substance is represented in Figure 3. The element is Sulfur.