What is an atom,molecule and atomicity of a substance? - Future Study Point

What is an atom,molecule and atomicity of a substance?

atom,molecules and atomicity

What is an atom,molecule and atomicity of a substance?

atom,molecules and atomicity

Atoms: The atom is the smallest indivisible particle of a substance that can’t exist independently, atom is also composed of subatomic particles protons, neutrons, and electrons. The subatomic particles proton, neutron, and electron were discovered by Goldstein, Chedwik, and J.J Thompson respectively. Although atoms and its subatomic particles can’t be seen directly by a device, scientists experiment on the observation of the different kinds of phenomena due to the content of matter shows the existence of atom and its subatomic particles. Atoms are as small as that even the tip of a needle can accommodate more than 1 lakh atoms.

Click for online shopping

Future Study Point.Deal: Cloths, Laptops, Computers, Mobiles, Shoes etc

NCERT Solutions Class 10 Science from chapter 1 to 16

Molecules: A molecule is the smallest particle of a substance that exists independently and shows the characteristic of the substance. Molecules are composed of two or more than two atoms. In a molecule, atoms are bonded to each other with a covalent bond.

As an example, are the molecules of carbon dioxide, oxygen, and hydrogen respectively.

In the equation of chemical reaction molecules of a substance are represented for showing the involvement of the substance in the chemical reaction.

As an example

The size of molecule depends on the number of atoms available in it

What are Surds and how to compare them?

The atomicity: Atomicity of a substance is the number of atoms in its molecule. The atomicity of oxygen, hydrogen, Carbon dioxide and water is 2,2,3 and 3 respectively. If we know the molecular formula of a substance then we can easily calculate the atomicity of a substance.

Example: What are the atomicity of the following substance

(a) Sulphur (b) Phosphorus (c) Helium (d) Sodium Chloride (e) Potassium Chlorate (f) Calcium hydroxide (g) Nitric acid (f) Sulphuric acid

Ans. (a) Sulphur molecule has 8 atoms so its atomicity is 8

(b) Phosphorus molecule has 4 atoms so its atomicity is 4

(c) The formula of Sodium chloride (NaCl) shows that it has one atom of Na and 1 atom of Cl, so its atomicity is 2.

(d) The formula of Potassium Chlorate (KClO3) shows that it has one atom of K , 1 atom of Cl and 3 atoms of oxygen ,so its atomicity is 5.

(e) The formula of Calcium hydroxide Ca(OH)2 shows that it has one atom of Ca ,2 atoms of O, 2 atoms of H, so its atomicity is 5.

(f) The formula of Sulphuric acid (H2SO4) shows that it has 2 atoms of H and 1 atom of S and 4 atoms of O, so its atomicity is 2.

(h) The formula of aluminum sulphate Al2(SO4)3  shows that it has 2 atoms of Al, 3 atoms of sulphur, and 12 atoms of oxygen so its atomicity is 17.

Related questions on molecular mass, molar mass and moles.

Q1. What is the molecular mass of sodium nitrate?

Q2. How many moles are in 440 gm of carbon dioxide?

Q3. How many carbon atoms are in 1 kg of carbon dioxide?

Q4. How many sulphate ions are in 400 gm of aluminum sulphate?

Q5. What is the molar mass of Sodium carbonate?

Q6. What is the atomicity of calcium chloride?

Q7. How many moles are in electrons.

Q8. How many electrons are in 64 gm of oxygen gas?

You can also study

How to determine Valency,net charge of an ion and Molecular formula of a substance.

Molar mass,molecular mass and mole concept

Evoporation,Vapourization and Latent heat -Class 9 CBSE notes

Important Science Notes for Class 9 and 10 grade

Class 10 CBSE Science Notes

Class 10 Biology Viva Voce Questions and Answers for CBSE Board 2020-21

Class 10 chemistry Viva Voce Questions and Answers

Class 10 Physics Viva Voce Questions and Answers

Class 10 Chemistry Practical Based Questions and Answers

What are the physical and chemical properties of metals?

Type of Chemical Reactions with Complete detail

Chemical properties of Acids and Bases-A note for grade 10 students

What is pH value and its importance in everyday life.

Ozone Layer and How it is Getting depleted.

Myopia, Hypermetropia and Presbyopia

Human eye structure and its function

Electrical resistance and conductance

Electric Current and Heating effect of Electric Current

What is a potential difference across an electric field ?

Difference between soaps and detergents

Why do the star twinkle but planets don’t

Light reflection, refraction, scattering, and dispersion

Extraction of metals as per the activity series

Ionic and covalent compounds and the difference between them

Food chain and food web in an ecosystem

What is God particle ?

Class 9 CBSE Science Notes

Three Laws of Motion: Class 9 CBSE

Thrust and Pressure : Difference

The Complete Detail of Archimedes Principal

Average Speed and Average Velocity: Differences

How to evaluate recoil velocity of gun

If energy is conserved then why do we need to save it for future generations?

What is universal law of gravitational force

NCERT Solutions of Science and Maths for Class 9,10,11 and 12

NCERT Solutions for class 9 maths

Chapter 1- Number SystemChapter 9-Areas of parallelogram and triangles
Chapter 2-PolynomialChapter 10-Circles
Chapter 3- Coordinate GeometryChapter 11-Construction
Chapter 4- Linear equations in two variablesChapter 12-Heron’s Formula
Chapter 5- Introduction to Euclid’s GeometryChapter 13-Surface Areas and Volumes
Chapter 6-Lines and AnglesChapter 14-Statistics
Chapter 7-TrianglesChapter 15-Probability
Chapter 8- Quadrilateral

NCERT Solutions for class 9 science 

Chapter 1-Matter in our surroundingsChapter 9- Force and laws of motion
Chapter 2-Is matter around us pure?Chapter 10- Gravitation
Chapter3- Atoms and MoleculesChapter 11- Work and Energy
Chapter 4-Structure of the AtomChapter 12- Sound
Chapter 5-Fundamental unit of lifeChapter 13-Why do we fall ill ?
Chapter 6- TissuesChapter 14- Natural Resources
Chapter 7- Diversity in living organismChapter 15-Improvement in food resources
Chapter 8- MotionLast years question papers & sample papers

CBSE Class 9-Question paper of science 2020 with solutions

CBSE Class 9-Sample paper of science

CBSE Class 9-Unsolved question paper of science 2019

NCERT Solutions for class 10 maths

Chapter 1-Real numberChapter 9-Some application of Trigonometry
Chapter 2-PolynomialChapter 10-Circles
Chapter 3-Linear equationsChapter 11- Construction
Chapter 4- Quadratic equationsChapter 12-Area related to circle
Chapter 5-Arithmetic ProgressionChapter 13-Surface areas and Volume
Chapter 6-TriangleChapter 14-Statistics
Chapter 7- Co-ordinate geometryChapter 15-Probability
Chapter 8-Trigonometry

CBSE Class 10-Question paper of maths 2021 with solutions

CBSE Class 10-Half yearly question paper of maths 2020 with solutions

CBSE Class 10 -Question paper of maths 2020 with solutions

CBSE Class 10-Question paper of maths 2019 with solutions

NCERT Solutions for Class 10 Science

Chapter 1- Chemical reactions and equationsChapter 9- Heredity and Evolution
Chapter 2- Acid, Base and SaltChapter 10- Light reflection and refraction
Chapter 3- Metals and Non-MetalsChapter 11- Human eye and colorful world
Chapter 4- Carbon and its CompoundsChapter 12- Electricity
Chapter 5-Periodic classification of elementsChapter 13-Magnetic effect of electric current
Chapter 6- Life ProcessChapter 14-Sources of Energy
Chapter 7-Control and CoordinationChapter 15-Environment
Chapter 8- How do organisms reproduce?Chapter 16-Management of Natural Resources

Solutions of Class 10 Science Sample Paper and Question Papers for Term-1 and Term 2 2021-22 CBSE Board

Solution of Class 10 Science Question Paper Preboard 2021-22:Term 2 CBSE Board Exam

Solutions of Class 10 Science Sample Paper Term-1 2021-22 CBSE Board

Class 10 Science Sample Paper for Term 2 CBSE Board Exam 2021-22 with Solution

Solutions of Class 10 Science Question Paper Preboard Examination (First) 2021 -22 Class 10 Science

CBSE Class 10 – Question paper of science 2020 with solutions

CBSE class 10 -Sample paper of Science 2020

NCERT Solutions for class 11 maths

Chapter 1-SetsChapter 9-Sequences and Series
Chapter 2- Relations and functionsChapter 10- Straight Lines
Chapter 3- TrigonometryChapter 11-Conic Sections
Chapter 4-Principle of mathematical inductionChapter 12-Introduction to three Dimensional Geometry
Chapter 5-Complex numbersChapter 13- Limits and Derivatives
Chapter 6- Linear InequalitiesChapter 14-Mathematical Reasoning
Chapter 7- Permutations and CombinationsChapter 15- Statistics
Chapter 8- Binomial Theorem Chapter 16- Probability

CBSE Class 11-Question paper of maths 2015

CBSE Class 11 – Second unit test of maths 2021 with solutions

NCERT solutions for class 12 maths

Chapter 1-Relations and FunctionsChapter 9-Differential Equations
Chapter 2-Inverse Trigonometric FunctionsChapter 10-Vector Algebra
Chapter 3-MatricesChapter 11 – Three Dimensional Geometry
Chapter 4-DeterminantsChapter 12-Linear Programming
Chapter 5- Continuity and DifferentiabilityChapter 13-Probability
Chapter 6- Application of DerivationCBSE Class 12- Question paper of maths 2021 with solutions
Chapter 7- Integrals
Chapter 8-Application of Integrals

Class 12 Solutions of Maths Latest Sample Paper Published by CBSE for 2021-22 Term 2

Class 12 Maths Important Questions-Application of Integrals

Class 12 Maths Important questions on Chapter 7 Integral with Solutions for term 2 CBSE Board 2021-22

Solutions of Class 12 Maths Question Paper of Preboard -2 Exam Term-2 CBSE Board 2021-22

Solutions of class 12  maths question paper 2021 preboard exam CBSE


Scroll to Top