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Boron ( Chemical Symbol B)

Element N. 5 of the periodic system. Atomic weight 10.82. It is gray in color, ignites at about 1112 (degrees) F. and burns with a brilliant green flame, but its melting point in a non oxidizing atmosphere is about 4000 (degrees) F. Boron is used in steel in minute quantities for one purpose only to increase the hardenability as in case hardening and to increase strength and hardness penetration.