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How many electrons can have the values n=2, l=1, and s=+½ in the configuration 1s2, 2s2, 2p3?
NTS 2015 DUHS and JSMU
Chemistry
Atomic Structure
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In a discharge tube, at room pressure there is
The difference between soft and hard X-rays is of:
NUMS 2016
Physics
Atomic Structure
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Maximum ____ electrons can be placed in one orbital:
NUMS 2020
Chemistry
Atomic Structure
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The radii of the second orbit of the hydrogen atom calculated from Bohr’s model is:
NTS 2013
Chemistry
Atomic Structure
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Many elements have fractional atomic masses. This is because:
NUMS 2020
Chemistry
Atomic Structure
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The spectrum of He is expected to be similar to that of:
NUMS 2014
Chemistry
Atomic Structure
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The lightest positive rays obtained is from:
NUMS 2020
Chemistry
Atomic Structure
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Breaking of neutron produces?
The Balmer series lies in which region of the electromagnetic spectrum?
NTS 2015 DUHS and JSMU
Chemistry
Atomic Structure
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Electronic configuration of M2+ ion is 2, 8, 14 and its atomic weight is 56 amu. The number of neutrons in its nucleus are:
NTS 2017
Chemistry
Atomic Structure
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Which of the following has lowest e/m ratio?
PMC 2020
Chemistry
Atomic Structure
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Which of the following has the maximum number of unpaired electrons?
NUMS 2015
Chemistry
Atomic Structure
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Which pair has 1 electron in it’s ‘s’ orbital?
PMC 2020
Chemistry
Atomic Structure
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Which of the following statements is correct?
NTS 2011
Chemistry
Atomic Structure
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Spectrum of which series is in the visible region?
The correct order of orbitals is:
The maximum number of electrons that an orbital can accommodate is/are:
NTS 2010
Chemistry
Atomic Structure
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J.J Thomson determined the:
NTS 2016 DUHS & JSMU
Chemistry
Atomic Structure
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Which orbitals always possess same energy:
The relationship between quantum number n and l is:
PMC 2020
Chemistry
Atomic Structure
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The charge on one proton is:
NUMS 2019 Reconduct
Chemistry
Atomic Structure
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The ground state of an atom corresponds to a state of :
NTS 2016 DUHS & JSMU
Chemistry
Atomic Structure
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The amount of energy associated with quantum of radiation is directly proportional to:
NUMS 2020
Chemistry
Atomic Structure
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The radius of the third Bohr orbit is:
NTS 2016 DUHS & JSMU
Chemistry
Atomic Structure
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P.E of an electron in the orbit of an atom Is
The maximum possible number of electrons a shell ‘n’ can accommodate is given by:
NTS 2012
Chemistry
Atomic Structure
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For a multi-electron atom, the highest energy level among the following is:
NTS 2013
Chemistry
Atomic Structure
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Diameter of an atom is in the range of?
NUMS 2014
Chemistry
Atomic Structure
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Diameter of Hydrogen atom is?
X-rays are defined as:
NUMS 2020
Chemistry
Atomic Structure
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The quantum numbers +½ and -½ for the electron spin represent:
NTS 2017
Chemistry
Atomic Structure
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The Neutron was discovered by:
NTS 2018
Chemistry
Atomic Structure
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If an electron of hydrogen atom jumps from 5th orbit to 7’h orbit, its atomic radius increases
The maximum number of electrons in an atom with n=3 and l=2 is:
NUMS 2015
Chemistry
Atomic Structure
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Which quantum number decides energy of orbitals?
The atomic number Z of an atom represents the:
NTS 2018
Physics
Atomic Structure
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d subshell has
If an election jumps from 6th orbit to 2nd orbit then decrease in radius will be?
If uncertainty in the position of an electron is zero the uncertainty in its Momentum is?
NTS 2015 DUHS and JSMU
Chemistry
Atomic Structure
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Which one of the following is not an isotope of hydrogen:
NUMS 2014
Chemistry
Atomic Structure
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Shape of the orbital occupied by an electron is defined by:
NTS 2016 DUHS & JSMU
Chemistry
Atomic Structure
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A 4s orbital has:
NUMS 2014
Chemistry
Atomic Structure
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Which of the following orbital will be filled first than 4p?
NUMS 2020
Chemistry
Atomic Structure
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Bracket series of 14-atom is in which of the following regions of electromagnetic spectrum?
Number of transitions possible for an electron in the 6th shell are
When B- particles are sent through a thin metal foil, most of them go straight through the foil as:
NTS 2017
Chemistry
Atomic Structure
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Which of the following best describes the emission spectrum of atomic hydrogen?
NTS 2015 DUHS and JSMU
Chemistry
Atomic Structure
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An element has configuration 2, 8, 1. It belongs to, ______.
NTS 2016 SMBBMC
Chemistry
Atomic Structure
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Which of the following does not have an inert gas configuration?
NUMS 2015
Chemistry
Atomic Structure
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The number of electrons present in n=2 , l = 1 and m = 1, 0, -1 are:
NTS 2016 DUHS & JSMU
Chemistry
Atomic Structure
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“In an atom no two electrons can have the some set of four Quantum numbers” is stated by:
NTS 2013
Chemistry
Atomic Structure
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Which of the following quantum numbers are for p-subshell?
Nitrogen and phosphorus have 3 of their valence electrons unpaired because of:
NTS 2014
Chemistry
Atomic Structure
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Quantum number values for ‘2p’ orbitals are:
PMC 2020
Chemistry
Atomic Structure
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Which of the following does not show variable valency?
NUMS 2015
Chemistry
Atomic Structure
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When alpha particles are bombarded on beryllium
Mass of electron in a.m.u is:
NUMS 2020
Chemistry
Atomic Structure
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Spectrum of which series is in the UV region?
What are the values of orbital quantum number/0 and magnetic quantum number(m) for subshell?
Choose the value of the Rydberg constant among the following values:
NUMS 2014
Chemistry
Atomic Structure
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Which of the following fundamental particles have the same mass/kg?
NUMS 2020
Chemistry
Atomic Structure
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If an electron makes a transition from 4th orbit to inner orbits, then the wavelength for which the radius is maximum, lies in which of the following series?
Electronic configuration of K is:
NUMS 2014
Chemistry
Atomic Structure
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If an electron jumps from fourth to first orbit, which of the following series will it show?
Which of the following is the electronic configuration of 19K?
NUMS 2016
Chemistry
Atomic Structure
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Which is the configuration of Cr?
NUMS 2015
Chemistry
Atomic Structure
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The amount of energy released by absorbing an electron in the valence shell is:
NTS 2013
Chemistry
Atomic Structure
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The electronic configuration of iron is:
NTS 2011
Chemistry
Atomic Structure
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) The velocity of electron in outermost shell Is?