Question

What is the fifth symbol on the periodic table?

Answer 1

Hint :The periodic table, also known as the periodic table of elements, is a tabular display of the chemical elements, which are arranged by atomic number, electron configuration, and recurring chemical properties. The seven rows of the table, called periods, generally have metals on left and nonmetals on right. The columns, called groups, contain elements with similar chemical behaviours.

Complete Step By Step Answer:
The fifth element of the periodic table is Boron. The symbol of boron is $$B$$. Its atomic number is $$5$$.. The atomic mass of boron is $$10.81amu$$ or $$10.81g/mol$$. It is produced entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, it is a low-abundance element in the Solar System and in the Earth's crust.
Boron is concentrated on Earth by the water-solubility of its more common naturally occurring compounds, the borate minerals. These are mined industrially as evaporites, such as borax and kernite.
Elemental boron, boron oxide, boric acid, borates, and many organoboron compounds are relatively nontoxic to humans and animals (with toxicity similar to that of table salt). Dietary supplementation of boron may be helpful for bone growth, wound healing, and antioxidant activity, and insufficient amount of boron in diet may result in boron deficiency. Single medical doses of $$20g$$ boric acid for neutron capture therapy have been used without undue toxicity.

Note :
The boranes (boron hydrogen compounds) and similar gaseous compounds are quite poisonous. The boranes are also highly flammable and require special care when handling. Sodium borohydride presents a fire hazard owing to its reducing nature and the liberation of hydrogen on contact with acid. Boron halides are corrosive. Boron is necessary for plant growth, but an excess of boron is toxic to plants, and occurs particularly in acidic soil.