# On the periodic table: Why are groups of elements organized by 'letter' [duplicate]

Why are the groups of elements on the periodic table organized into areas represented by the letters s,p,d,f,g, and h? What does this mean?

## marked as duplicate by Pritt Balagopal, paracetamol, Nilay Ghosh, Mithoron, Todd MinehardtJul 10 '17 at 12:10

• Letters g and h confuse me a bit. Could you please provide an example of elements that belong to these groups? – andselisk Jul 10 '17 at 4:13
• This all is just great, spectroscopic notations and stuff, but from the question it looks like OP encountered a PTE with g and h blocks, which I'd really like to look at. – andselisk Jul 10 '17 at 4:52