How are elements arranged in the periodic table?

How are elements arranged in the periodic table?

• A. Colors and shapes
• B. Mass numbers only
• C. Periods and groups
• D. Attraction and repulsion

Answer: (C)

Elements are arranged in the periodic table into periods (rows) and groups (columns). The table is organized by increasing atomic number, and this layout creates patterns in properties: elements in the same period share the same energy level, while elements in the same group have the same number of valence electrons, giving them similar chemical behavior. As you move across a period, properties change gradually from metals to nonmetals, and as you move down a group, trends in reactivity and other characteristics repeat. This orderly arrangement lets us predict how elements will react based on where they sit in the table.

Elements are arranged in the periodic table into periods (rows) and groups (columns). The table is organized by increasing atomic number, and this layout creates patterns in properties: elements in the same period share the same energy level, while elements in the same group have the same number of valence electrons, giving them similar chemical behavior. As you move across a period, properties change gradually from metals to nonmetals, and as you move down a group, trends in reactivity and other characteristics repeat. This orderly arrangement lets us predict how elements will react based on where they sit in the table.