| Description |
Non-metal with several allotropes. Amorphous boron is a dark powder un-reactive
to oxygen, water, acids, and alkalis. Forms metal borides with most
metals. Used in borosilicate glass, detergents, and fire retardants.
Strong neutron capture ability is put to best use as a moderator for
nuclear reactions involving neutrons. Diagnostic tests:
Many compounds containing boron tinge the flame test an intense yellowish
green. This effect is masked if the mineral contains sodium. The flame
test color lasts only an instant and may be confused with the green flame
color produced from barium minerals.
In a small quantity of sulfuric acid solution, add 10 drops of methyl alcohol.
Stir, and set fire to the mixture. The first flash of green flame confirms
the presence of boron. If the green flame color occurs after the first
flash of flame, barium or copper is present.
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