some p block elements

some p block elements

by Mosarrat Jehan

​what are p block elements????

​ The elements of the periodic table belonging to groups 13 to 18 are known as p-Block elements. because in these elements  last electron enters in p sub shell or d orbital. The p- block elements lie in the extreme right of the periodic table.

​Introduction

• ​Group 13- Boron famiy

• ​Group 14-Carbon family

• ​Group 15-Nitrogen family

• ​Group 16-Oxygen family/chalcogen

• ​Group 17- Halogen

• ​Group 18-noble gas

​pnemonics

​Group 13 elements:

​Baigan Aaloo Gajar In Thali

​B Al Ga In Tl

​Group 14 elements:

​Chemistry Sir Gives Sanki Problems

​C Si Ge Sn Pb

​

​​Atomic and ionic radii

​Element       B      Al      Ga      In      Tl

At. radius    88       143      135     167    170

1. The atomic and ionic radii of group 13 elements are compared to corresponding elements of group 2. From left to right in the period, the magnitude of nuclear charge increases but the electrons are added to, the same shell. These electrons do not screen each other, therefore, the electrons experience greater nuclear charge.

2. In other words, effective nuclear charge increases and thus, size decreases. Therefore, the elements of this group have smaller size than the corresponding elements of second group.

3. On moving down the group both atomic and ionic radii are expected to increase due to the addition of new shells. However, the observed atomic radius of Al (143 pm) is slightly more than that of Ga (l35 pm). Due to the presence of 3d¹⁰ electrons  which have poor shielding effect.

​atomic Radii

​The atomic radii increases on moving down the group from C to Pb

Multiple Choice

What is the general electronic configuration of group 14 elements

•  ns²np²

•  ns²np⁴

•  ns²np¹

•  ns²np⁶

Multiple Choice

.Atomic radius of Ga is slightly smaller than that of Al.

• due to poorshielding effect of d electrons

• due to stronger sdhielding effect of d electrons

• atomic number of Ga is more than Al

• none