Periodic Table Overview

The periodic table is like a map that arranges elements based on their properties, making them easier to study and understand.

It was first developed by Mendeleev, who noticed patterns when elements were arranged by their atomic mass.

Today, the modern periodic table organizes elements by their atomic number.

Elements are placed in rows called periods and columns called groups, with elements in the same group having similar properties.

For example, elements in Group 1, like sodium and potassium, are highly reactive metals, while elements in Group 18, like helium and neon, are noble gases that rarely react.

Every element is identified by a unique chemical symbol, such as H for hydrogen and O for oxygen, along with its atomic number.

The periodic table also classifies elements into metals, nonmetals, and metalloids based on their properties, like conductivity and appearance.

Metals are shiny and good conductors of electricity, nonmetals are often dull and poor conductors of electricity, and metalloids have properties that fall between both.

With over 118 elements discovered, the periodic table keeps growing as new elements are identified.