Question

What are the elements in the periodic table defined by?

Answer 1

The elements in the periodic table are defined by their atomic number, which represents the number of protons in the nucleus of an atom. Each element has a unique atomic number, which determines its place in the periodic table. Additionally, elements are categorized by their chemical properties, such as their reactivity, electronegativity, and electron configurations. The periodic table also organizes elements into rows called periods and columns called groups or families based on similarities in their properties.