Definitions [4]
Define free electrons.
Electrons in outer orbits are weakly bound with the nucleus. In solids these weakly bound electrons leave their individual atom and become a part of it. These electrons are known as free electrons.
Define bound electrons.
As nucleus is positively charged it strongly attracts the negative charged electrons. The electron orbit close to the nucleus are tightly bound by strong attractive force of nucleus. These electrons are known as bound electrons.
Define the term radioactivity.
The phenomenon of spontaneous disintegration of an unstable nucleus of a naturally occurring isotope accompanied by emission of active radiations, α particles, β particles and γ radiations is called radioactivity.
Radioactivity is a nuclear phenomenon. It is the process of spontaneous emission of α or β and γ radiations from the nucleus of atoms during their decay.
Concepts [21]
- Important Salts in Daily Life
- Properties and Uses of Sodium Chloride
- Preparation and Uses of Baking Soda
- Preparation and Uses of Bleaching Powder
- Preparation and Uses of Washing Soda
- Some Crystalline Salts
- Soap
- Radioactivity
- Nature of Radioactive Radiation
- Characteristics of Alpha, Beta and Gamma Rays
- Uses of Radioactive Isotopes
- Harmful Effects of Radiation
- Chemical Substances in Day to Day Life
- Food Colours and Essences
- Dye
- Artificial Colours
- Deodorant
- Teflon
- Powder Coating
- Anodizing
- Ceramic
