Hello, this week we're almost at the top of the periodic table because we're taking a look at the lighter than air gas helium. But for this chemist a helium filled bobbing balloon is actually a source ...

The noble gases (Helium, Neon, Argon etc ... Unfortunately for Meyer, his work wasn’t published until 1870, a year after Mendeleev’s periodic table had been published. Even after 1870, Meyer and ...

each of the elements in group 18 end with the suffix ~on, instead of the suffix for the rest of the periodic table, ~ium (helium is the exception to this rule due to historical precedent).

And generations of children have sung the words, "hydrogen and helium, lithium, beryllium..." in an attempt to memorise some of the 118 elements. This year, the periodic table of chemical elements ...

So how has the periodic table been put together ... Any letters that follow will be lower case letters, for example, helium is He. Some element symbols are simple. For example, oxygen is O.Others ...

If an atom has 2 protons, that’s an atom of the element helium. If it has 7 protons, that’s nitrogen. But the logic of the periodic table also relies upon the number and organisation of electr ...

In 1869, Mendeleev's first periodic table did not include them ... Remarkably, Ramsey then went on to isolate helium (1895) and radon (1908) and, with Morris Travers, to discover krypton, neon ...