atoms of same elements having different mass number

atoms of different elements having same mass number

atoms of same elements having same mass number

atoms of different elements having same number of neutrons

Match List ‐ I (Experiment performed) with List ‐ II (Phenomena discovered/associated)and select the correct option from the options given below the lists List-I List-II ( a ) Davisson and Germer experiment i Wave nature of electrons b Millikan's oil drop experiment ii Charge of an electron c Rutherford experiment iii Quantisation of energy levels d Franck-Hertz experiment ( iv ) Existence of the nucleus

( a ) ‐ ( i ) , ( b ) ‐ ( ii ) , ( c ) ‐ ( iv ) , ( d ) ‐ ( iii )

( a ) ‐ ( iii ) , ( b ) ‐ ( iv ) , ( c ) ‐ ( i ) , ( d ) ‐ ( ii )

( a ) ‐ ( iv ) , ( b ) ‐ ( iii ) , ( c ) ‐ ( ii ) , ( d ) ‐ ( i )

( a ) ‐ ( i ) , ( b ) ‐ ( ii ) , ( c ) ‐ ( iii ) , ( d ) ‐ ( iv )

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The ratio of charge and mass would be greater for

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Important Questions on Structure of Atom

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Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Among the following species which option contains all isoelectronic species?

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

The correct set of four quantum numbers for the valence electrons of rubidium atom

(Z = 37)

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Which of the following pairs of ions is isoelectronic and isostructural?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

The fundamental particles present in the nucleus of an atom are

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

In Millikan's oil drop experiment, the forces acting on the oil drop are?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

B e^{2 +}

is isoelectronic with which of the following ions?

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Which of the following pairs of iron are isoelectronic and isostructural?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Isotopes are

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Electrons in a cathode ray tube have been emitted with a velocity of $1000 {ms}^{- 1}$ . The number of following statements which is/are true about the emitted radiation is

Given : $h = 6 \times 10^{- 34} Js, m_{e} = 9 \times 10^{- 31} kg$

(A ) The deBroglie wavelength of the electron emitted is $666.67 nm$

(B ) The characteristic of electrons emitted depend upon the material of the electrodes of the cathode ray tube.

(D ) The nature of the emitted electrons depends on the nature of the gas present in cathode ray tube..

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Which of the following is the correct unit of angular momentum of an electron in an orbital of an atom ?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Hydrogen has three isotopes

(A), (B)

and

(C) .

If the number of neutron(s) in

(A), (B)

and

(C)

respectively, are

(x), (y)

and

(z),

the sum of

(x), (y)

and

(z)

MEDIUM

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Among the following, the correct statement about cathode ray discharge tube is

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

The number of protons, neutrons and electrons in

_{71}^{175} Lu

, respectively, are

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

The isoelectronic set of ions is:

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Which of the following are isoelectronic species?

I. $\overset{+}{C} H_{3}$

II. ${NH}_{2}^{-}$

III. ${NH}_{4}^{+}$

IV. ${NH}_{3}$

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

From the following pairs of ions which one is not an iso-electronic pair?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

In the following sets of ions, which one is not isoelectronic with the rest of the species?

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Match List $‐ I$ (Experiment performed) with List $‐ II$ (Phenomena discovered/associated)and select the correct option from the options given below the lists

	List-I		List-II
$(a)$	Davisson and Germer experiment	$(i)$	Wave nature of electrons
$(b)$	Millikan's oil drop experiment	$(ii)$	Charge of an electron
$(c)$	Rutherford experiment	$(iii)$	Quantisation of energy levels
$(d)$	Franck-Hertz experiment	$(iv)$	Existence of the nucleus

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

The number of times the comparative mass of a neutron is heavier than an electron is:

EASY

Chemistry>Physical Chemistry>Structure of Atom>Discovery of Sub-Atomic Particles

Arrange the following particles in an increasing order of values of

e / m

ratio: electron

(e),

proton

(p),

neutron

(n)

and

α

-particle

(α) -

The ratio of charge and mass would be greater for

Important Questions on Structure of Atom

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