How is a molecule defined?

How is a molecule defined?

• A. A single atom
• B. Two or more chemically bonded atoms
• C. A structure that includes only covalent bonds
• D. A type of gas

Answer: (B)

A molecule is defined as two or more chemically bonded atoms. This definition encompasses a variety of substances, ranging from simple molecules like oxygen (O2), which consists of two oxygen atoms bonded together, to complex molecules like glucose (C6H12O6), which consists of multiple atoms of carbon, hydrogen, and oxygen that are bonded in a specific arrangement. The critical aspect of a molecule is the chemical bond which holds the atoms together, allowing them to function as a single unit with defined properties. In contrast, a single atom does not constitute a molecule as it lacks the necessary bonding with other atoms. Molecules can consist of atoms of the same element or different elements bonded together, so the concept is broader than just covalent bonds; ionic and metallic bonds also play a role in the formation of compounds, but they involve different definitions of a molecule. Lastly, while gases can be made up of molecules, particularly diatomic gases like nitrogen (N2) or hydrogen (H2), this doesn't define what a molecule is but rather one of the states in which they can exist.

A molecule is defined as two or more chemically bonded atoms. This definition encompasses a variety of substances, ranging from simple molecules like oxygen (O2), which consists of two oxygen atoms bonded together, to complex molecules like glucose (C6H12O6), which consists of multiple atoms of carbon, hydrogen, and oxygen that are bonded in a specific arrangement. The critical aspect of a molecule is the chemical bond which holds the atoms together, allowing them to function as a single unit with defined properties.

In contrast, a single atom does not constitute a molecule as it lacks the necessary bonding with other atoms. Molecules can consist of atoms of the same element or different elements bonded together, so the concept is broader than just covalent bonds; ionic and metallic bonds also play a role in the formation of compounds, but they involve different definitions of a molecule. Lastly, while gases can be made up of molecules, particularly diatomic gases like nitrogen (N2) or hydrogen (H2), this doesn't define what a molecule is but rather one of the states in which they can exist.