Name: Understanding Silicate and Its Uses
Uploaded: 2019-07-19
Duration: 9 min 26 s
Description: Do you know that silicates are used to make glass and ceramics? It also plays a vital role in our daily life. Let's learn how it simplifies our lives.

Question

Describe the changes in physical and chemical properties, which may be observed in the elements

C, Si, Ge, Sn

and

Pb .

Give reasons for these changes.

Accepted Answer

Physical properties:

Size: The group size increases as go down because of increase in the number of shells.

Electronegativity: Down the group, electronegativity decreases on increasing the size of elements.

Ionisation enthalpy: Down the group, it decreases on increasing size because on increasing size attraction on electron becomes less and electron can be removed easily, but due to lanthanide contraction $Sn and Pb$ exchange their positions hence order is: $C > Si > Ge > Pb > Sn$ .

Electron affinity: Generally, electron affinity decreases as the size is increased and attraction coming electron decreases but second-period element shows less electron affinity than third-period element due to high electron density in smaller size element of the second period so coming electron will feel repulsion and will not come easily so order is: $Si > C > Ge > Sn > Pb$ .

Chemical properties:

Oxidation state: Oxidation generally decreases due to inert pair effect. Normal oxidation state is $+ 4$ , but to inert pair of $s$ orbital, so, its electron does not go for bonding due to high attraction nucleus and shows $+ 2$ oxidation more stable.

Oxidising property: It increases due to inert pair effect.

Reducing property: It decreases due to inert pair effect.

Describe the changes in physical and chemical properties, which may be observed in the elements $C, Si, Ge, Sn$ and $Pb .$ Give reasons for these changes.

Important Questions on The Group 14 Elements

Learn and Prepare for any exam you want !

Describe the changes in physical and chemical properties, which may be observed in the elements C, Si, Ge, Sn and Pb. Give reasons for these changes.

Important Questions on The Group 14 Elements

Learn and Prepare for any exam you want !

Describe the changes in physical and chemical properties, which may be observed in the elements $C, Si, Ge, Sn$ and $Pb .$ Give reasons for these changes.