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CBSE - IX - Chemistry - Structure of the Atom

The fuel used in neuclear power plants is    a) U-235      or      b) Enriched U-235

Asked by md775016 18th February 2018, 9:01 PM
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CBSE - IX - Chemistry - Structure of the Atom

The sum of protons, electron and nutrons in heaviest isotope of hydrogen? 

Asked by amitjena226 20th January 2018, 10:20 AM
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CBSE - IX - Chemistry - Structure of the Atom

The number of nucleons in D2 molecule?? 

Asked by amitjena226 20th January 2018, 10:17 AM
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CBSE - IX - Chemistry - Structure of the Atom

Q the half line of a radioactive isotope is 1.5 hrs. The mass of it that remains undecayed after 6 hours if the initial mass of spectrum of the isotope of 32g is

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CBSE - IX - Chemistry - Structure of the Atom

Helium atom has two electrons in its valence shell but its valency is zero. Explain.

Asked by gpnkumar0 11th March 2017, 12:37 PM
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CBSE - IX - Chemistry - Structure of the Atom

Explain isotopes and isobars with the help of suitable examples.

Asked by Topperlearning User 4th April 2016, 11:37 AM
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CBSE - IX - Chemistry - Structure of the Atom

Explain atomic number and atomic mass number.

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CBSE - IX - Chemistry - Structure of the Atom

(a) begin mathsize 12px style Mg presubscript 12 presuperscript 24 space and space Mg presubscript 12 presuperscript 26 end style are symbols of two isotopes of Magnesium. Compare atoms of these isotopes with respect to

(i)Composition of their Nuclei

(ii)Electronic configuration and valency

(b)Give the reason why two isotopes of magnesium have different mass numbers.

Asked by Topperlearning User 4th April 2016, 10:54 AM
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CBSE - IX - Chemistry - Structure of the Atom

The average atomic mass of a sample of an element X is 35.5 u. What are the percentages of isotopes begin mathsize 12px style straight X presubscript 17 presuperscript 37 end style and  in the sample?

Asked by Topperlearning User 4th April 2016, 10:39 AM
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CBSE - IX - Chemistry - Structure of the Atom

Sulphur dioxide (SO2) is a colourless pungent smelling gas and is a major air pollutant. (a) Write the electronic configuration of its constituent elements: Sulphur and Oxygen. (b) Write valency of Sulphur and Oxygen. (c) Are sulphur and oxygen isotopes of same element? Explain your answer.  

Asked by Topperlearning User 4th April 2016, 10:33 AM
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CBSE - IX - Chemistry - Structure of the Atom

What are isobars? Explain with the example.

Asked by Topperlearning User 17th March 2015, 9:13 AM
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CBSE - IX - Chemistry - Structure of the Atom

How is the following pair of atom related?

begin mathsize 12px style Ar presubscript 18 presuperscript 40 comma space Ca presubscript 20 presuperscript 40 end style

 

Asked by Topperlearning User 17th March 2015, 8:55 AM
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CBSE - IX - Chemistry - Structure of the Atom

(i) Why is large part of the atom neglected when calculating the mass of the atom?(ii) Give reason why atoms combine with each other.(iii) In the notation of an atom, how are the atomic number, mass number, and symbol of the element written?

Asked by Topperlearning User 17th March 2015, 8:53 AM
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CBSE - IX - Chemistry - Structure of the Atom

What is the electronic configuration of isotopes of chlorine and isobars of calcium and argon?

Asked by Topperlearning User 16th March 2015, 5:24 PM
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CBSE - IX - Chemistry - Structure of the Atom

State the relationship between the atoms given below. Define the term used for this relationship. Write one characteristic feature of such atoms.

begin mathsize 12px style Cl presubscript 17 presuperscript 35 comma space Cl presubscript 17 presuperscript 37 end style

Asked by Topperlearning User 16th March 2015, 5:21 PM
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CBSE - IX - Chemistry - Structure of the Atom

If atomic number and number of protons is given then how to find out number of neutrons??

Asked by anjali1999kaushik 21st February 2015, 7:36 PM
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CBSE - IX - Chemistry - Structure of the Atom

Sir,I don not understand that the radioactive isotopes have Carbon14,Arsenic74,Uranium237,Cobalt60.What does the number represent in Carbon14, Uranium235 etc.

Asked by subhajit.690 11th October 2014, 10:14 AM
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CBSE - IX - Chemistry - Structure of the Atom

The composition of the nuclei of two atomic species X and Y is given as under:   X Y Protons 6 6 Neutrons 6 8 Give the mass number of X and Y. What is the relationship between these two species?

Asked by Topperlearning User 20th May 2014, 1:41 PM
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CBSE - IX - Chemistry - Structure of the Atom

Write 3 differences between isobars and isotopes.

Asked by Topperlearning User 14th May 2014, 1:17 PM
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CBSE - IX - Chemistry - Structure of the Atom

(a) What is the relationship between two elements X and Y whose atomic numbers are 18 and 20 respectively but their mass numbers remain same as 40 ? (b) Which has more number of electrons Na or Na+? Why? (c) Name the isotope used to treat (a) Goitre (b) Cancer.

Asked by Topperlearning User 14th May 2014, 1:16 PM
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CBSE - IX - Chemistry - Structure of the Atom

Which of the following are isotopes and which are isobars? Argon, Protium, Calcium, Deuterium. Explain why the isotopes differ in physical properties?

Asked by Topperlearning User 14th May 2014, 1:15 PM
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CBSE - IX - Chemistry - Structure of the Atom

What are isotopes? Write 3 isotopes of hydrogen. Why do isotopes show similar chemical properties?

Asked by Topperlearning User 14th May 2014, 1:13 PM
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CBSE - IX - Chemistry - Structure of the Atom

On the basis of number of protons, neutrons and electrons in the samples given below, identify (a) the cation (b) the pair of isobars (c) the pair of isotopes. Sample Protons Neutrons Electrons A 17 18 16 B 18 19 18 C 17 20 17 D 17 17 17

Asked by Topperlearning User 14th May 2014, 6:40 AM
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CBSE - IX - Chemistry - Structure of the Atom

Given: Number of protons = 13; Number of electrons = 13; Number of neutrons = 14; Calculate the mass number of the element.

Asked by Topperlearning User 14th May 2014, 6:35 AM
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CBSE - IX - Chemistry - Structure of the Atom

How is mass number related to atomic number and neutrons present in the nucleus of the atom?

Asked by Topperlearning User 13th May 2014, 3:08 PM
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CBSE - IX - Chemistry - Structure of the Atom

Write any three uses of isotopes.

Asked by Topperlearning User 13th May 2014, 3:05 PM
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CBSE - IX - Chemistry - Structure of the Atom

Define mass number.

Asked by Topperlearning User 13th May 2014, 3:04 PM
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CBSE - IX - Chemistry - Structure of the Atom

What determines the mass number of an atom?

Asked by Topperlearning User 13th May 2014, 3:04 PM
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CBSE - IX - Chemistry - Structure of the Atom

What determines the chemical properties of an element?

Asked by Topperlearning User 13th May 2014, 3:03 PM
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CBSE - IX - Chemistry - Structure of the Atom

Define atomic number. How is it denoted? Give two examples of atomic numbers.

Asked by Topperlearning User 13th May 2014, 3:03 PM
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CBSE - IX - Chemistry - Structure of the Atom

Atomic no. and atomic mass

Asked by 19th March 2008, 9:09 AM
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