The single dot in braille represents 'A'
Outer electrons
A dot diagram (also called an Electron Dot Diagram, and a Lewis Structure) is a way to show the valence electrons that surround an element. See related link for a good lesson on how to make a dot diagram.
Well Louis Braille invented Braille, a way for blind people to read and write, which is still used today.
The Lewis dot formula for bromine chloride is very easy to write. It starts with a singly bonded Br and Cl atom in the center. On every unbonded side of both atoms there is a single pair of dots.
There are three kinds of "dots" in a atom. Electrons, neutrons, protons. Electrons have a negative charge, neutrons have no charge, and protons have a positive charge. The numbers of dots represent what kind of atom it is, as on the periodic table of the elements. The atomic number and mass tells you how many electrons/neutrons/or protons there are.
One raised dot equates to the letter "A" ; see related link to additional information concerning Braille .
a single dot
The letter A in braille uses a single dot in the upper left corner of the braille cell. All other braille letters use 2 or more dots.
Using standard Braille transcription, where the numbers 1, 2, and 3 represent the dots on the top left, middle left, and bottom left respectively, and the numbers 4, 5, and 6 represent the dots on the top right, middle right, and bottom right respectively, the letter f is written 1,2,4. That is, a dot in the top left cell, a dot in the middle left cell, and a dot in the top right cell.
There are 256 possible combinations of dots in 8-dot braille (if you include a blank cell as a character).
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Braille
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The letter b in Braille is represented by 1,2 - that is, a dot in the top left and middle left cell.
(*As it is difficult to write out the dot forms in text, see the related link for Braille translations.)
Braille