Which of the following element has its symbol given in the correct manner?
Aluminium - Al
Fluorine - f
Boron - b
Symbols of elements is written as per the IUPAC guidelines. The first letter of a symbol must always be written as a capital letter (upper case) and the second letter as a small letter (lower case)
Example: Argon - Ar, Barium - Ba, Chlorine - Cl