GATE XL Atomic Structure and Periodicity PYQs & Answers

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Questions 1–10 of 14. Imported answers require independent review unless marked reviewed.

Topic practice 14 questionsPage 1 of 2

The CORRECT combination(s) of element and their ground state electronic configuration is/are

(Atomic Numbers: Ar-18, Sc-21, Cr-24, Mn-25 and Fe-26)

Your answerSelect all correct options. You can choose more than one.

Sc – [Ar] 4s² 3d¹

Cr – [Ar] 4s² 3d⁴

Mn – [Ar] 4s² 3d⁵

Fe – [Ar] 4s² 3d⁶

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The option(s) with the CORRECT order of ionisation energy is/are

Your answerSelect all correct options. You can choose more than one.

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Energy of the transition from

for hydrogen atom is E × 10³ cm⁻¹.

Given: Rydberg constant for hydrogen: 1.097 × 10⁷ m⁻¹.

Value of E is _____________. (rounded off to two decimal places)

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The maximum number of electrons that can be accommodated in the shell with n = 2 is ______ (in integer).

(Given: n = principal quantum number)

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Choose the CORRECT trend(s) of the first ionization energies among the following. (Given: Atomic numbers C: 6; N: 7; O: 8; F: 9; Si: 14; P: 15; S: 16; Cl: 17)

Your answerSelect all correct options. You can choose more than one.

C < N > O < F

Si < P > S < Cl

C < N < O < F

Si < P < S < Cl

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The number of radial node(s) for the valence orbital of U(III) ion is _____ (in integer). (Given: Atomic number of U is 92)

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Which among the following has the least second ionization energy?

Your answerChoose one option.

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A 16 mW monochromatic light emits

photons in 1 second. When this light incidents on a metal strip, photoelectrons are emitted. The wavelength of the emitted photoelectrons (in Å) is ______ (round off to one decimal place).

Given: Work function of the metal = 2.0 eV

Charge of an electron =

Mass of an electron =

Planck’s constant =

J s

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The ground state energy of an electron in a hydrogen atom is −13.60 eV. The energy of the electron in the third excited state is ______ eV (rounded off to two decimal places).

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The azimuthal quantum number (

) of an electron in the

orbital of a copper atom (atomic number: 29) is _____.

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GATE XL Atomic Structure and Periodicity PYQs

How to practice Atomic Structure and Periodicity

Question 15

Question 26

Question 25

Question 17

Question 16

Question 26

Question 12

Question 27

Question 4

Question 4