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If the nitrogen atom had electronic configuration $1 s^{7}$ , it would have energy lower than that of the normal ground state configuration $1 s^{2} 2 s^{2} 2 p^{3}$ , because the electrons would be closer to the nucleus. Yet $1 s^{7}$ is not observed, because it violates

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Important Questions on Atomic Structure

MEDIUM

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 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}

MEDIUM

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

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}

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:

MEDIUM

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

EASY

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

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

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

The element with

Z = 120

(not yet discovered) will be a/an

MEDIUM

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:

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

How many electrons can fit in each orbital for which

n = 3

and

l = 1

MEDIUM

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:

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 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?

MEDIUM

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

Energy associated with the first orbit of

{He}^{+}

MEDIUM

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?

MEDIUM

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

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

(At. No. Z =

22

)

If the nitrogen atom had electronic configuration 1s7, it would have energy lower than that of the normal ground state configuration 1s2 2s2 2p3, because the electrons would be closer to the nucleus. Yet 1s7 is not observed, because it violates

Important Questions on Atomic Structure

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If the nitrogen atom had electronic configuration $1 s^{7}$ , it would have energy lower than that of the normal ground state configuration $1 s^{2} 2 s^{2} 2 p^{3}$ , because the electrons would be closer to the nucleus. Yet $1 s^{7}$ is not observed, because it violates