Element \(A\) is an atomic element, and element \(B\) is a diatomic molecular element. Using circles to represent atoms of \(\mathrm{A}\) and squares to represent atoms of \(\mathrm{B}\), draw molecular-level views of each element.

Atomic elements are the building blocks of matter, consisting of atoms that typically exist as isolated, single units rather than bonded with other atoms. These elements are represented on the periodic table and are denoted by chemical symbols that correspond to their names. For instance, helium (He), neon (Ne), and argon (Ar) are noble gases that are atomic elements. They exist naturally in their atomic form, with no strong tendency to bond with other atoms due to their stable electronic configurations.

Understanding the concept of atomic elements is foundational in chemistry. It allows us to visualize and predict the behavior of substances under various conditions. When representing atomic elements graphically, such as in the given exercise, each atom is depicted as an individual circle, separate from the others to emphasize their singular nature.

Diatomic molecular elements are a specific class of elements that are composed of molecules made of two identical atoms bonded together. This bonding behavior is a result of the atoms' desire to achieve a more stable energetic state. On the molecular level, these elements, such as hydrogen (H2), nitrogen (N2), and oxygen (O2), are always found as pairs. The chemical bond that holds these two atoms together can be represented as a line connecting them.

In diagrams or models, we represent these pairs of bonded atoms with connecting shapes, such as the squares used in the exercise to represent element B. These visual models help clarify the distinction between atomic and molecular elements, where diatomic molecules are shown as two connected units to represent their bonded state.

Chemical symbols and structures are shorthand notations for representing elements and compounds in a clear and standardized way. Chemical symbols consist of one or two letters derived from the element's name and are found on the periodic table—carbon is represented by 'C', hydrogen by 'H', and so on. Structures, on the other hand, can range from simple representations, like the circles and squares for atomic and diatomic elements, to complex diagrams that illustrate the three-dimensional arrangement of atoms within a molecule.

The ability to interpret and draw these symbols and structures is crucial for students of chemistry. It allows for the communication of complex information in a simple form, and an understanding of chemical symbols and structures can reveal information about how a substance might interact with others, its physical properties, and how it can be used in various processes.