B - Boron - periodic table of the elements

Black amorphous boron powder was isolated from borax by Joseph Louis Gay-Lussac (with Thenard) and independently by Davy in 1808. Hard, red crystals of pure boron were not produced for almost a century.

Atomic number	-	5		Density	g/mL	2	.34
Atomic weight	u	10	.81	Melting point	K	2300
Bonding radius	A	0	.82	Boiling point	K	4275
Atomic radius	A	1	.17	Heat of vaporization	kJ/mol	489	.7
Ionization Potential	V	8	.298	Heat of fusion	kJ/mol	50	.2
Electronegativity	-	2	.04	Specific heat	J/gK	1	.02
The oxide is mildly acidic.				Crystal are rhombohedral.
Electron configuration: 1s² 2s² 2p¹

Other elements of the periodic table

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

H He

Li Be B C N O F Ne

Na Mg Al Si P S Cl Ar

K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr

Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe

Cs Ba La * Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn

Fr Ra Ac ** Rf Db Sg Bh Hs Mt 110 111 112 113

Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu

Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr