Some elements, particularly the transition metals, do not always have the same valency in their different compounds. The valency of these elements is usually given in roman numerals inside brackets.
“Now our daughter is truly unique!” Yep, you read that right. Her daughter's name is spelt KVIIIlyn, using Roman numerals, but it’s still pronounced ‘Kaitlyn’. A photo of the magazine was later shared ...
Arabic numerals are introduced to Europe in the eighth and ninth centuries A.D. Roman numerals remain in use in some parts of Europe until the seventeenth century. The Arabic system introduced the ...