Question

In the modern periodic table, elements are arranged in order of increasing atomic numbers which is related to the electronic configuration. Depending upon the type of orbitals receiving the last electron, the elements in the periodic table have been divided into four blocks, viz, s, p, d and f. The modern periodic table consists of 7 periods and 18 groups. Each period begins with the filling of a new energy shell. In accordance with the Arfbau principle, the seven periods have 2, 8, 8, 18, 18, 32 and 32 elements respectively. The seventh period is still incomplete. To avoid the periodic table being too long, the two series of f-block elements, called lanthanoids and actinoids are placed at the bottom of the main body of the periodic table.

The last element of the p-block in 6^th period is represented by the outermost electronic configuration.

विकल्प

• 7s²7p⁶

• 5f¹⁴6d¹⁰7s²7p⁰

• 4f¹⁴5d¹⁰6s²6p⁶

• 4f¹⁴5d¹⁰6s²6p⁴ 

Answer 1

4f¹⁴5d¹⁰6s²6p⁶ 

Explanation:

The last element of p-block in 6^th period is ₈₆Rn with configuration 4f¹⁴5d¹⁰6s²6p².