The answer is Boron :)
You think probable to boron nitride (borazon); but other nitrides (of titanium, zirconium, vanadium, niobium, etc.) are also very hard. But no one equal the hardness of diamond.
Boron trifluoride.
Boron is a metalloid, while aluminium is a metal. The size of the aluminium atom is much greater than boron, so electropositivity increases from boron to aluminium. But then electropositivity decreases from aluminium to thallium due to the poor shielding effect of the d10 orbital.
The elements below Boron in group 13 generally give electrons to form ions, although they can form covalent compounds. Boron forms covalent bonds rather than ionic so it shares electrons.
how match of boron you need to take per day
Boron has 5 neutrons in its nucleus.
In modern day, boron is now obtained by heating borax and carbon together.
Boron is safe if given in the recommended dose. Doctors recommend taking no more than 20 milligrams of boron per day.
the average cost of crystalline boron is $5/g.
2ml/g
At room temperature chlorine is a gas, boron is a solid. So at room temperature boron is much denser than chlorine.
Elemental boron (as compared to bornon compounds) is a metal, which looks much like aluminum.
boron was named boron because of the properties it has
The answer is Boron :)
You think probable to boron nitride (borazon); but other nitrides (of titanium, zirconium, vanadium, niobium, etc.) are also very hard. But no one equal the hardness of diamond.
two allotropes of boron ; crystalline boron and brown amorphous boron