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

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

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

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

Equation

Answer:

(i)

(A) Equation

The electronic configuration of H atom is Equation

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

Equation

(B) Equation

The electronic configuration of Na atom is Equation .

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

Equation

(C) Equation

The electronic configuration of 0 atom is Equation

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

Equation

Equation

The electronic configuration of Equation atom is Equation

Equation ion = Equation

(ii)

(A) Equation

Completing the electron configuration of the element as

Equation

Equation

Equation

Equation

(B) Equation

Completing the electron configuration of the element as

Equation

Equation

Equation

(C) Equation

Completing the electron configuration of element as

Equation

Equation

Equation

(iii)

(A) Equation

The electronic configuration of the element is Equation

Equation

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

(B) Equation

The electronic configuration of the element is Equation

Equation

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

(C) Equation

The electronic configuration of the element is [Ar] Equation

Equation

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

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

Answer:

Equation

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

Equation

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