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Assertion $(A)$ : Atoms with completely filled and half filled subshells are stable.

Reason $(R) :$ Completely filled and half filled subshells have symmetrical distribution of electrons and have maximum exchange energy.

The Correct answer is

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Important Questions on Atomic Structure

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Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

The electronic configuration which obeys Hund's rule for the ground state of carbon atom is

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Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

G d (64)

has __ unpaired electrons with sum of its spin as __.

EASY

Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

The maximum number of electrons that can be filled in the shell with the principal quantum number

n = 4

EASY

Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

The total number of orbitals associated with the principal quantum number

5

is:

EASY

Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

The element with

Z = 120

(not yet discovered) will be a/an

EASY

Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

Aqueous solution of which of the following salts will not contain ions with the electronic configuration

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6}

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Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

Which statement is incorrect for the periodic classification of elements?

EASY

Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

The orbital nearest to the nucleus is

EASY

Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

How many electrons can fit in each orbital for which

n = 3

and

l = 1

EASY

Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

The number of valence electrons in an atom with electronic configuration

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{3}

EASY

Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

The group number, number of valence electrons, and valency of an element with atomic number

15,

respectively, are:

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Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

If the principal quantum number

n = 6,

the correct sequence of filling of electrons will be:

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Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

4 d, 5 p, 5 f

and

6 p

orbitals are arranged in the order of decreasing energy. The correct option is:

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Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

Which one of the following statements is wrong?

EASY

Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

The number of unpaired electrons in

{Ni}^{2 +}

(atomic number

= 28

) are

EASY

Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

Which of the following electron is most tightly bound to the nucleus?

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Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

Energy associated with the first orbit of

{He}^{+}

EASY

Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

The element which readily forms an ionic bond has the electronic configuration

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Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

The number of

d

-electrons in

{Fe}^{2 +} (Z = 26)

is not equal to the number of electrons in which one of the following?

EASY

Chemistry>Physical Chemistry>Atomic Structure>Electronic Configuration of Atoms

Which is the correct order of increasing energy of the listed orbitals in the atom of titanium?

(At. No. Z =

22

)

Assertion (A) : Atoms with completely filled and half filled subshells are stable. Reason (R): Completely filled and half filled subshells have symmetrical distribution of electrons and have maximum exchange energy. The Correct answer is

Important Questions on Atomic Structure

Learn and Prepare for any exam you want !

Assertion $(A)$ : Atoms with completely filled and half filled subshells are stable.

Reason $(R) :$ Completely filled and half filled subshells have symmetrical distribution of electrons and have maximum exchange energy.

The Correct answer is