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Model Of An Atom Free Doubts and Solutions

CBSE - IX - Chemistry - Structure of the Atom

IS THE 1ST POSTULATE OF DALTON( all matter are made of very tiny particles called atom ) IS RIGHT?

Asked by fahim0660 19th July 2018, 11:46 PM
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CBSE - IX - Chemistry - Structure of the Atom

what are alpha particles

Asked by Shreyansh 6th January 2018, 11:10 AM
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CBSE - IX - Chemistry - Structure of the Atom

i want the electronic shell configuration of first 50 elements and their valencies Ex:-Image result for iron shell configuration

Asked by md775016 3rd August 2017, 5:03 PM
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CBSE - IX - Chemistry - Structure of the Atom

What are the properties of electrons?

Asked by Topperlearning User 30th March 2016, 4:01 PM
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CBSE - IX - Chemistry - Structure of the Atom

Why did Thomson proposed the model of an atom to be similar to that of a Christmas pudding?

Asked by Topperlearning User 30th March 2016, 3:56 PM
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CBSE - IX - Chemistry - Structure of the Atom

Explain the formation of protons from gas discharge tube as stated by Goldstein.

Asked by Topperlearning User 30th March 2016, 3:56 PM
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CBSE - IX - Chemistry - Structure of the Atom

Who discovered canal rays? Describe the experiment of the discovery of canal rays in brief.

Asked by Topperlearning User 30th March 2016, 3:55 PM
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CBSE - IX - Chemistry - Structure of the Atom

Explain the formation of cathode rays as stated by Thomson. What is the absolute mass of an electron?

Asked by Topperlearning User 30th March 2016, 3:54 PM
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CBSE - IX - Chemistry - Structure of the Atom

List out the postulates of Thomson's model of atom.

Asked by Topperlearning User 30th March 2016, 2:46 PM
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CBSE - IX - Chemistry - Structure of the Atom

Does gas at ordinary pressure conduct electricity? Explain.

Asked by Topperlearning User 30th March 2016, 2:45 PM
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CBSE - IX - Chemistry - Structure of the Atom

State the limitations of J.J. Thomson's model of an atom.

Asked by Topperlearning User 30th March 2016, 2:38 PM
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CBSE - IX - Chemistry - Structure of the Atom

Write five differences between isotopes and isobars.

Asked by mkmishra101 14th March 2016, 6:50 PM
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CBSE - IX - Chemistry - Structure of the Atom

what is atomicity??

Asked by Mayank 10th March 2016, 6:24 PM
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CBSE - IX - Chemistry - Structure of the Atom

an element X forms the following compounds with hydrogen, carbon, and phosphorous:P2X3, P2X5, H2X2, H2X, CX2, CX. find the valencies of X and other element present in the compound.
 
 

Asked by R.S.CHAUHAN 8th March 2016, 8:32 PM
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CBSE - IX - Chemistry - Structure of the Atom

IN THE RUTHERFORD EXPERIMENT IF BETA PARTICLES(NEGATIVELY CHARGED) WERE SELECTED IN THE PLACE OF ALPHA PARTICLES,WHAT WOULD BE THE OBSERVATIONS AND RESULTS OBTAINED

Asked by yuthikasharma75 21st February 2016, 7:58 PM
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CBSE - IX - Chemistry - Structure of the Atom

It is said that rutherford presented his model that electrons are stable by saying their is force of attraction towards the nucleus and centrifugal force away from the nucleus. But this was proved wrong. Then how did Bohr explain it? 

Asked by Varun 31st January 2016, 8:25 AM
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CBSE - IX - Chemistry - Structure of the Atom

the nucleus of an atom is positively charged and the electrons which revolve around it contain a negative charge. Then why doesn't  the electron end up going into the nucleus as opposite charges attract each other?

Asked by Meenakshi 17th January 2016, 8:59 AM
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CBSE - IX - Chemistry - Structure of the Atom

can you explain me the detailed concept of cathode, anode, cations and anions with examples and diagrams and how they are interlinked with each other.

Asked by skbl2009 2nd January 2016, 9:30 PM
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CBSE - IX - Chemistry - Structure of the Atom

bohr -bury scheme of distribution of electrons?

Asked by geetanjaliajmani 30th December 2015, 11:19 PM
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CBSE - IX - Chemistry - Structure of the Atom

Describe model of an atom by the following scientist
1.Thomson's
2.Rutherford's and drawbacks also
3.Bohr's
 

Asked by sbprasadsinha 22nd February 2015, 10:19 PM
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CBSE - IX - Chemistry - Structure of the Atom

why innermore shells have less energy? and why outermore shells have more energy ?

Asked by nimishagupta0409 26th January 2015, 1:58 PM
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CBSE - IX - Chemistry - Structure of the Atom

Why do different gases give different types of anode rays in the discharge tube experiment?

Asked by Topperlearning User 22nd January 2015, 9:58 AM
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CBSE - IX - Chemistry - Structure of the Atom

Name the subatomic particles of an atom present inside the nucleus.

Asked by Topperlearning User 22nd January 2015, 9:39 AM
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CBSE - IX - Chemistry - Structure of the Atom

respected mam/sir,
according to neils bohr postulates, why the negatively charged electrons do not radiate or loose energy?

Asked by nimishagupta0409 14th January 2015, 10:55 PM
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CBSE - IX - Chemistry - Structure of the Atom

explain the thomosens,bohrs and ruthersfords experiments
 

Asked by paddipawar 21st November 2014, 6:36 AM
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CBSE - IX - Chemistry - Structure of the Atom

What is the charge of a neutron and where is it located in an atom?

Asked by Topperlearning User 19th November 2014, 3:28 PM
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CBSE - IX - Chemistry - Structure of the Atom

Where are electrons found in an atom?

Asked by Topperlearning User 19th November 2014, 3:28 PM
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CBSE - IX - Chemistry - Structure of the Atom

explain neil bohr's theory and dalton's thory
 
 

Asked by kanishkapanwar2424 2nd September 2014, 5:57 PM
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CBSE - IX - Chemistry - Structure of the Atom

Why is the mass of electrons ignored while calculating the atomic mass of an element?

Asked by Topperlearning User 26th August 2014, 2:31 PM
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CBSE - IX - Chemistry - Structure of the Atom

What are protons? Where are they located in the atom? How are they represented?

Asked by Topperlearning User 22nd August 2014, 4:33 PM
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CBSE - IX - Chemistry - Structure of the Atom

(a) If an atom contains one electron and one proton, will it carry any charge? (b) On the basis of Thomson's model of an atom, explain how the atom is electrically neutral.

Asked by Topperlearning User 13th May 2014, 11:28 AM
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CBSE - IX - Chemistry - Structure of the Atom

(a) What is the relative charge and mass of canal rays? (b) How are the canal rays different from electrons in terms of charge and mass?

Asked by Topperlearning User 13th May 2014, 11:24 AM
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CBSE - IX - Chemistry - Structure of the Atom

What does the formation of cathode rays and anode rays tell us about the atoms?

Asked by Topperlearning User 13th May 2014, 11:24 AM
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CBSE - IX - Chemistry - Structure of the Atom

In the experiment performed by J.J. Thomson, how was it concluded that cathode rays consist of negatively charged particles?

Asked by Topperlearning User 13th May 2014, 11:20 AM
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CBSE - IX - Chemistry - Structure of the Atom

Why were canal rays also called as anode rays?

Asked by Topperlearning User 13th May 2014, 11:18 AM
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CBSE - IX - Chemistry - Structure of the Atom

Give two properties of cathode rays.

Asked by Topperlearning User 13th May 2014, 11:17 AM
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CBSE - IX - Chemistry - Structure of the Atom

Define an electron. What is the charge on it? How is an electron represented? Where is it located in the atom?

Asked by Topperlearning User 13th May 2014, 11:15 AM
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CBSE - IX - Chemistry - Structure of the Atom

How was the extra mass of 6 units in Carbon (atomic mass = 12 u) with no. of protons = 6 explained?

Asked by Topperlearning User 13th May 2014, 11:08 AM
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CBSE - IX - Chemistry - Structure of the Atom

expain bhor`s model of an atom

Asked by 11th March 2008, 10:48 PM
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CBSE - IX - Chemistry - Structure of the Atom

What is Atomic Theory?

Asked by 5th March 2008, 11:33 AM
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