Next-Gen

Boron Thing

by pirite
Last updated 4 years ago

Discipline:
Science
Subject:
Earth Sciences
Grade:
8

Test Glog

Boron

Date of Discovery: 1808 Discoverer: Sir Humphry Davy

Symbol: B Atomic Number: 5 Atomic Mass: 10.811 amu Melting Point: 2300.0 °C Boiling Point: 2550.0 °C Number of Protons/Electrons: 5 Number of Neutrons: 6 Classification: Metalloid Density @ 293 K: 2.34 g/cm3

One of the unusual properties of boron is the many physical forms, called allotropes, in which it occurs. Allotropes are forms of an element with different physical and chemical properties. One form of boron consists of clear red crystals with a density of 2.46 grams per cubic centimeter. A second form consists of black crystals with a metallic appearance and a density of 2.31 grams per cubic centimeter. Boron can also occur as a brown powder with no crystalline structure.

Physical properties

Boron combines with oxygen in the air to form boron trioxide ( B 2 O 3 ). Boron trioxide forms a thin film on the surface that prevents further reaction with oxygen.Boron is not soluble in water. It normally does not react with acids. In powder form, it reacts with hot nitric acid (HNO 3 ) and hot sulfuric acid (H 2 SO 4 ). It also dissolves in molten metals

Chemical properties

Things that are made of Boron

Sartsawat ,JP 8B


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