Chemistry Class 11 NCERT Solutions: Chapter 2 Structure of Atom Part 8

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Q: 23 (i) Write the electronic configurations of the following ions: (a) (b) (c) (d)

(ii) What are the atomic numbers of elements whose outermost electrons are represented by (a) ?

(iii) Which atoms are indicated by the following configurations?

Image of Oxygen and Sodium ion for Structure of Atom

Image of Oxygen and Sodium Ion

Image of Oxygen and Sodium ion for Structure of Atom

Answer:

(i)

(A)

The electronic configuration of H atom is

A negative charge on the species indicates the gain of an electron by it.

(B)

The electronic configuration of Na atom is .

A positive charge on the species indicates the loss of an electron by it.

(C)

The electronic configuration of 0 atom is

A negative charge on the species indicates the gain of an electron by it.

The electronic configuration of atom is

ion =

(ii)

(A)

Completing the electron configuration of the element as

(B)

Completing the electron configuration of the element as

(C)

Completing the electron configuration of element as

(iii)

(A)

The electronic configuration of the element is

Hence, the element with the electronic configuration lithium (Li).

(B)

The electronic configuration of the element is

Hence, the element with the electronic configuration is phosphorus (P).

(C)

The electronic configuration of the element is [Ar]

Hence, the element with the electronic configuration is scandium (Sc).

Q: 24 what is the lowest value of n that allows g orbitals to exist?

Answer:

As for any value ‘n’ of principal quantum number, the Azimuthal quantum number (l) can have a value from zero to (n-1).

Image showing Azimuthal quantum number.

Image Showing Azimuthal Quantum Number.

Image showing Azimuthal quantum number.