What does the number 5 mean in periodic table?
The significance of numbers in the periodic table depends on where they appear. The first set of numbers is the number of the element itself (atomic number). This equates to the number of protons in the nucleus. The element which has 5 as this number is Boron. Another use of the number 5 (usually written as the roman numeral V) is a group of elements which have 5 electrons in their outer shell, which includes Nitrogen, Phosphorous, Arsenic and others. If you’re making up a fictitious element, I suggest you go for one which doesn’t exist or at least is theoretical, such as element 114. Steel itself, of course, is an alloy (mixture) of elements, rather than an element in its own right. It is principally composed of Iron, which has symbol Fe and atomic number 26.
