A circle labeled "metal" with a smaller circle labeled "aluminum" completely inside it
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Gold Copper Brass Aluminum
Aluminium is a non metal element. Atomic mass of it is 26.982.
Aluminium
Roman numerals represent numbers. They are used in chemical formulas to represent the valancy of transitional metals but as neither Sodium or Fluorine is a transitional metal there is no use for Roman numerals in the formula NaF.
No, coins are not an element. Some coins may be made of nearly pure gold, silver, aluminum, or other metal elements, but most present-day coins are made of various metal alloys, often with different composition on the inside than on the outside.