(A) $J.J.$ Thomson discovered the electron through his cathode ray tube experiments and proposed that they are part of the atom.Later,$E.$ Rutherford

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Electrons by $J.J.$ Thomson and nucleus by $E.$ Rutherford

(A) $J.J.$ Thomson discovered the electron through his cathode ray tube experiments and proposed that they are part of the atom.Later,$E.$ Rutherford performed the alpha-particle scattering experiment,which led to the discovery of a small,dense,positively charged center called the nucleus.He suggested that electrons revolve outside this nucleus.

Class 9 Science STRUCTURE OF THE ATOM Mix Example - STRUCTURE OF THE ATOM

Easy

The presence of electrons outside the nucleus and the nucleus at the centre of the atom was suggested by:

A
Electrons by $J.J.$ Thomson and nucleus by $E.$ Rutherford
B
Electrons by $J.J.$ Thomson and nucleus by $E.$ Goldstein
C
Electrons by $J.N.$ Lockyer and nucleus by $E.$ Rutherford
D
Electrons by $E.$ Rutherford and nucleus by $J.J.$ Thomson

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STRUCTURE OF THE ATOM

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Mix Example - STRUCTURE OF THE ATOM

The ion of an element has $3$ positive charges. The mass number of the atom is $27$ and the number of neutrons is $14$. What is the number of electrons in the ion?

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$(a)$ Which popular experiment is shown in the figure?
$(b)$ List three observations of this experiment.
$(c)$ State conclusions drawn from each observation of this experiment.
$(d)$ State the model of atom suggested on the basis of the above experiment.

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State whether the following statement is true or false:
In a chemical substance,the elements are always present in varying proportions by mass.

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Who discovered the neutron?

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$(a)$ An ion $M^{2+}$ contains $10$ electrons and $12$ neutrons. What is the atomic number and mass number of the element $M$?
$(b)$ Is it possible in an atom to have $12$ protons and $13$ electrons? Explain.
$(c)$ Why is helium gas inert?

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The presence of electrons outside the nucleus and the nucleus at the centre of the atom was suggested by:

Similar Questions

The ion of an element has $3$ positive charges. The mass number of the atom is $27$ and the number of neutrons is $14$. What is the number of electrons in the ion?

$(a)$ Which popular experiment is shown in the figure?$(b)$ List three observations of this experiment.$(c)$ State conclusions drawn from each observation of this experiment.$(d)$ State the model of atom suggested on the basis of the above experiment.

State whether the following statement is true or false:In a chemical substance,the elements are always present in varying proportions by mass.

Who discovered the neutron?

$(a)$ An ion $M^{2+}$ contains $10$ electrons and $12$ neutrons. What is the atomic number and mass number of the element $M$?$(b)$ Is it possible in an atom to have $12$ protons and $13$ electrons? Explain.$(c)$ Why is helium gas inert?

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$(a)$ Which popular experiment is shown in the figure?
$(b)$ List three observations of this experiment.
$(c)$ State conclusions drawn from each observation of this experiment.
$(d)$ State the model of atom suggested on the basis of the above experiment.

State whether the following statement is true or false:
In a chemical substance,the elements are always present in varying proportions by mass.

$(a)$ An ion $M^{2+}$ contains $10$ electrons and $12$ neutrons. What is the atomic number and mass number of the element $M$?
$(b)$ Is it possible in an atom to have $12$ protons and $13$ electrons? Explain.
$(c)$ Why is helium gas inert?