How are the properties of crystal vary upon point defects?

How do the properties of crystals vary with imperfections?

How are the physical properties of rubber improved by vulcanisation process?

When electrons are trapped into the crystal in anion vacancy, the defect is known as

What is periodic property? How the following properties vary in a group and in a period? Explain. Metallic character.

What is a periodic property? How the following properties vary in a group and in a period? Expain (a) Atomic radius.

What is a periodic property? How the following properties vary in a group and in a period? Expain (b) Electron gain enthalpy.

What is a periodic property? How the following properties vary in a group and in a period? Explain (a) IP.