Chemistry

Scandium is the first of transition elements. Its atomic number is 21 whereas its atomic mass is 44.95. It has 21 electrons.

The chemical element Bismuth is a metal present in group number 15 of the periodic table. Its atomic number is 83 and its atomic mass is 208.98.

Silver is a precious metal present in group number 11 of the periodic table. Its atomic number is 47 whereas its atomic mass is 107.86.

Radon is the non-metallic natural radioactive element that belongs to the family of noble gases in group number 18 of the periodic table. The radon’s atomic number is 86 whereas its atomic mass is 222.

Lead is a metal located in group number 14 of the periodic table. The atomic number of lead is 82 whereas its atomic mass is 207.2. The single atom of lead contains 82 electrons.

The halogens do not respond straight with oxygen. With the help of some indirect methods, adhering to oxides of team VIIA components have been made.

Bleaching powder is a light yellowish powder existing with a strong smell of chlorine. It is soluble in water but because of the visibility of impurities, we never observe a clear solution.

A crystal lattice is an array of points representing atoms, ions, or molecules of a crystal, arranged at different sites in three-dimensional space.

Xenon exists in the air to a really little degree (0.08 ppm). It is obtained as a by-product throughout the fractional distillation of air. Xenon is available readily in cylindrical tubes at high pressure. It reacts with fluorine yet not with water.

Electrophilic substitution reactions are chain reactions in which an electrophile displaces a functional group in a substance, which is typically, yet not always, a hydrogen atom.