Complete the following table. Group 1 elements Outer electronic configuration: ……………….

No. Element Condensed orbital notation i. Fluorine (Z = 9) [He] 2s22p5 ii. Scandium (Z = 21) [Ar] 4s23d1 iii. Cobalt (Z = 27) [Ar] 4s23d7 iv. Zinc (Z = 30) [Ar] 4s2 3d10

Correct option is B) octet

The modem periodic table is based on the atomic numbers of the elements. When elements are arranged in an increasing order of atomic number (Z), periodicity is observed in their...

Hydrogen (H) : 1s2, Helium (He) : 2s2 Since helium has a complete duplet i.e., two electrons in its valence shell, it has the stable complete electronic configuration.

The subshell in which the last electron enters decides the block to which an element belongs. In group 1 and group 2 elements, the last electron is filled in the s...

The general outer electronic configuration of s-block elements is ns1-2. The general electronic configuration for the p-block elements is ns2np1-6.

The general outer electronic configuration of the d-block elements is ns0-2 (n-1)d1-10 while the general outer electronic configuration of the f-block elements is ns2 (n-1)d0-1 (n-2)f1-14.

i. Observed outer electronic configuration of europium (Eu) is 6s2 4f7 5d0. ii. In the observed electronic configuration of Eu, 4f subshell is half-filled which is a highly stable configuration. Therefore, observed electronic configuration...

i. 2He: 1s2 Here, n = 1. Therefore, 2He belongs to the 1st period. The shell n = 1 has only one subshell, namely 1s. The outer electronic configuration 1s2 of ‘He’ corresponds to the...

Sr. no. Property Down a group i Atomic radii Increases ii Ionic radii Increases iii Ionization enthalpy Decreases iv Electronegativity Decreases v Standard reduction potential Decreases