Periodic Table Complete Guide (2026) – Groups, Periods, Trends & FAQs

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Periodic Table Complete Guide (2026) – Groups, Periods, Trends & FAQs



Introduction

Chemistry ka sabse important chapter Periodic Table hai. Chahe aap Class 9, 10, 11, 12 ke student ho ya JEE, NEET aur CUET ki preparation kar rahe ho, periodic table ki understanding bahut zaroori hai. Is article me hum periodic table ko simple language me samjhenge.

What is the Periodic Table?

Periodic Table chemical elements ko arrange karne ka ek scientific system hai. Elements ko unke Atomic Number ke increasing order me rakha gaya hai.

Aaj ke time me 118 confirmed elements hain.

Who Invented the Periodic Table?

Russian scientist Dmitri Mendeleev ne 1869 me periodic table ka pehla version banaya. Baad me scientist Henry Moseley ne atomic number ke basis par modern periodic table develop ki.

Structure of the Periodic Table

Periodic Table me:

7 Periods (Horizontal Rows)

18 Groups (Vertical Columns)

Same group ke elements ke chemical properties kaafi similar hoti hain.

Types of Elements

1. Metals

Heat aur electricity ke good conductor.

Shiny hote hain.

Examples: Iron, Copper, Aluminium.

2. Non-Metals

Poor conductor.

Examples: Oxygen, Nitrogen, Sulfur.

3. Metalloids

Metals aur non-metals dono ke properties dikhate hain.

Examples: Silicon, Germanium.

Important Trends

Atomic Radius

Left se right jane par atomic radius kam hota hai.

Ionization Energy

Left se right increase hoti hai.

Electronegativity

Periodic table me left se right badhti hai.

Metallic Character

Top-right ki taraf metallic character kam hota hai.

Uses of the Periodic Table

Chemical reactions samajhne me.

Compound banane me.

JEE, NEET, CUET aur Board Exams me.

Scientific research me.

Frequently Asked Questions (FAQ)

Q1. Periodic Table me kitne elements hain?

Q2. Modern Periodic Table kisne diya?

Henry Moseley.

Q3. Mendeleev ne periodic table kab banayi?

Q4. Total groups kitne hote hain?

Q5. Total periods kitne hote hain?

Conclusion

Periodic Table chemistry ka foundation hai. Agar aap iske groups, periods aur trends ko achhi tarah samajh lete hain to chemistry ke bahut se chapters aasan ho jate hain. Daily thoda practice karne se aap competitive exams me bhi achha score kar sakte hain.

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