How are elements in the periodic table primarily organized?

• A. By the number of neutrons in the nucleus
• B. By alphabetical order of element names
• C. By increasing atomic number
• D. By increasing atomic mass

Answer: (C)

Verified step by step guidance

1. Understand that the periodic table is a systematic arrangement of elements based on their properties.
2. Recall that the atomic number of an element is the number of protons in its nucleus, which uniquely identifies each element.
3. Recognize that the periodic table is primarily organized by increasing atomic number, not by the number of neutrons, alphabetical order, or atomic mass.
4. Note that organizing by atomic number ensures elements with similar chemical properties fall into the same groups or columns.
5. Conclude that the correct organization principle is by increasing atomic number, which reflects the fundamental structure of atoms.