Past Year - 3 Mark Questions

Class 10
Chapter 5 Class 10 - Periodic Classification of Elements

## (iii) Which of these elements will form the most basic oxide?

Answer

 A B C D Atomic Number 12 13 14 15 Electronic Configuration 2,8,2 2,8,3 2,8,4 2,8,5

(i)

Number of valence electrons in D = 5

Valency of D = 8 - 5 = 3

(ii)

Because all of them have the same number of shells, A, B, C and D all belong to the same period

As we move from left to right across a period, atomic radii decreases.

A is the leftmost element, followed by B, followed by C and D is the rightmost element.

Therefore, A will have the largest atomic size.

(iii)

Since A has the largest atomic size, it will donate electrons most easily and therefore has the most metallic character . So it forms the most basic oxide.

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#### Maninder Singh

CA Maninder Singh is a Chartered Accountant for the past 13 years and a teacher from the past 17 years. He teaches Science, Economics, Accounting and English at Teachoo