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4

Isotones have same

A. mass number

B. nuclear mass

C. no. of neutrons

D. no. of electrons

Correct Answer :

C. no. of neutrons


Related Questions

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4

A dipositive ion Z++ has 2e- in the K shell, 8 e~ s in the L shell and 8e- in the M shell. Atomic number of Z is

A. 19

B. 20

C. 16

D. 15

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4

Bohr's concept of the orbit in an atom was contradicted by

A. de Broglie relationship

B. Uncertainty principle

C. Planck's hypothesis

D. Hund's rule

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4

In the nucleus of C20a40 there are

A. 40 protons and 20 electrons

B. 20 protons and 40 electrons

C. 20 protons and 40 neutrons

D. 20 protons and 20 neutrons

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4

Which of the following has the highest mass?

A. Neutron

B. Alpha particle

C. Electron

D. Deuterium

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4

Which elements is represented by the following electronic configuration?

A. Nitrogen

B. Oxygen

C. Fluorine

D. Neon

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4

The velocity of a photon is

A. dependent on its wavelength

B. dependent on its source

C. equal to cube of its amplitude

D. independent of its wavelength

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4

The maximum number of electrons in a sub-energy level is equal to

A. 4(2l+1)

B. 2(2l+1)

C. 2n2

D. n3

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4

The wavelength of an electron moving with a velocity 5×105m sec-1 is (h=6.63 ×10-34 kg m2 sec-1) 

A. 11.6 × 10-5m

B. 11.6 × 10-9m-1

C. 14.6 × 10-5m

D. 1.46 × 10-9m

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4

Electronic configuration of Cu+ is

A. [Ar]3d9

B. [Ar]3d10

C. [Ar]3d93s2

D. [Ar]3d74s14p1

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4

The number of unpaired electrons in a chromic ion Cr+3 (atomic number 24) is

A. 6

B. 4

C. 3

D. 1

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4

The size of nucleus is

A. 10-12 m

B. 10-8 m

C. 10-15 m

D. 10-10 m

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4

For a given energy level the number of orbitals is equal to

A. n2

B. 2l+1

C. 4(2l+3)

D. 2n3

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4

Mass of positron is the same to that of

A. proton

B. meson

C. electron

D. neutron

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4

Cathode rays contain a stream of

A. n

B. r

C. e0+1

D. e0-1

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4

Frequency of the wave having wave number 20000 cm-1 is

A. 6×1012 sec-1

B. 6×1014 sec-1

C. 3×1014MHz

D. 4×106Hz

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4

The atomic structure of an atom of an element is Is 1s2, 2s22p6, 3s23p6. The element is

A. Cl-35

B. S-32

C. N-18

D. O-16

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4

Isotones have same

A. mass number

B. nuclear mass

C. no. of neutrons

D. no. of electrons

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4

The fundamental particle that has least mass is

A. meson

B. alpha-particle

C. electron

D. neutron

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4

The number of neutrons in the deuterium atom is

A. 16

B. 3

C. 1

D. 0

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4

The corect set of quantum numbers for the impaired electron of fluorine atom is

A.

nlm
210

B.

nlm
211

C.

nlm
311

D.

nlm
300

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4

The charge on an atom of A1327l is

A. +40

B. +27

C. +14

D. Zero

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4

Argon is isoelectronic with

A. Mg++

B. Cl-

C. Br-

D. H+

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4

The number of unpaired electrons in fluorine atoms is/are

A. 4

B. 2

C. 1

D. 0

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4

The wavelength of an electron

A. is equal to that of light

B. remains constant with velocity

C. decreases with an increasing velocity

D. increases with an decreasing velocity

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4

Which of the following weighs the least?

A. 1 g of CO2

B. 2 litres of CO2 at N.T.P.

C. 3.01×1011 molecules of CO2

D. 3.01×1022 atoms of carbon

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4

When the electron is excited from K level to M level we get

A. γ- rays

B. cathode rays

C. continuous spectra

D. absorption spectra

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4

The maximum number of electrons that can be accommodated by an atom in g-sub-energy level are

A. 20

B. 25

C. 18

D. 12

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4

The ion that is isoelectronic with CO is

A. CN-

B. O2+

C. O2-

D. N2+

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4

The exchange of particles considered responsible for keeping the nucleons together are

A. meson

B. electron

C. positron

D. neutron

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4

Among the following ions, which are has the highest paramagnetism?

A. [Cr(H2O)6]+3

B. [Fe(H2O)6]+2

C. [Cu(H2O)6]+2

D. [Zn(H2O)6]+2