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 electronic configuration of the element which is just above the element with atomic number 43 in the same group is ______.

Options

• 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s²

• 1s² 2s² 2p⁶ 3s² 3p² 3d⁵ 4s³ 4p⁶

• 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s²

• 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁷ 4s²

Answer 1

The electronic configuration of the element which is just above the element with atomic number 43 in the same group is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s².

Explanation:

25Mn has electronic configuration 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁵ 4s².