ChemistryFundamental ConceptNCTB রসায়ন অধ্যায় ৩ (পদার্থের গঠন)
Atom
Bengali: পরমাণু•Pronunciation: অ্যাটম•Symbol: X
Standard Definition:
The smallest constituent unit of an element that retains its chemical properties and directly participates in chemical reactions.
📐 Mathematical Equation, Units & Dimensions
Defining Mathematical Equation
Standard SI Unit
amu (u) or kg(পরমাণুর ভর: $u$ (amu) বা $kg$)
Dimensional Analysis
CGS Unit
g
📖 Physical Concept & Comprehensive Explanation
An atom comprises a dense central nucleus containing positively charged protons and neutral neutrons, surrounded by an electron cloud. The atomic number Z dictates elemental identity, while the nucleon sum A = Z + N defines atomic mass number.
🎯 High-Yield Revision Points
- ✓Composed of three stable subatomic particles: electrons, protons, and neutrons.
- ✓Electrically neutral because proton count balances electron count.
- ✓The vast majority of an atom's volume is empty space.
Use Online Solver for Atom
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❓ Frequently Asked Exam Questions (FAQ)
Common questions in board and competitive entrance examinations
Q1: What is an atom?
An atom is the basic unit of a chemical element that participates in chemical combinations.