Periodic Table of Elements: Name, Symbols, Atomic Number & Atomic Mass (2025)

The periodic table of chemical elements is generally known as the periodic table. It is a chart in which all the discovered elements are organised in rows (called periods) and columns (called groups) based on their increasing atomic number. The periodic table is often used to get quick information about an element, like nuclear mass and chemical symbols. The regular table design also allows scientists to detect patterns in element properties such as electronegativity, ionization energy, and atomic radius.

Many scientists worked on the problem of grouping the elements, but in 1869, Dimitri Mendeleev published his version of the periodic table. Since then, the periodic table has changed to reflect almost 150 years of chemistry and physics technological progress and understanding. With 118 known elements today, it is often regarded as one of science’s most significant achievements in science.

Why was Mendeleev Periodic Table widely accepted?

Dimitri Mendeleev, often called the founding figure of the periodic table, introduced the initial version of the periodic table that resembles the one we currently use. However, there is a significant difference between Mendeleev’s approach and the way we organize the periodic table today.

Mendeleev organized his periodic table by arranging elements in order of increasing atomic mass. In contrast, the modern periodic table is organized by increasing atomic numbers.

Even though Mendeleev’s periodic table was based on the weight of atoms, he successfully predicted the existence and properties of certain elements. During his time, only about half of the elements we now know were discovered, and the information available about these elements was often incorrect. Mendeleev’s Periodic Table was published in the German Journal of Chemistry in 1869.

Periodic Table of Elements with Names, Symbols, and Atomic Number

All the elements of the Periodic Table are given below with their names and symbols.

First 30 Elements of the Periodic Table with Chemical Symbols and Atomic Mass

• ATOMIC NUMBER: An atom’s atomic number equals the number of protons in its nucleus or the number of electrons in an electrically neutral atom.
• ATOMIC MASS: The mass of an atom is called its atomic mass. It shows how many times a bit of an element is heavier than one-twelfth (1/12th) the mass of one carbon atom. It is measured in amu (atomic mass unit).

The first 30 elements of the periodic table with chemical symbols and atomic mass are given below in the following table:

What are the Types of Elements in the Periodic Table of Chemistry?

Elements are divided into four types;

• • Metals: Metals are complex solid elements that are ductile, malleable, and good heat and electrical conductors. (Silver-Ag, Iron-Fe)
  • Nonmetals: Nonmetals are drab and can exist as solids, liquids, or gases. (Oxygen-O, Carbon-C)
  • Metalloids: Metalloids are elements with characteristics that fall somewhere between metals and nonmetals. (Silicon-Si, Germanium-Ge)
  • Noble gasses: Noble gasses, often known as inert gasses, are a distinct class of elements that do not react with other ingredients. (Helium-He, Neon-Ne)

FAQs on Periodic Table of Elements