answersLogoWhite

0

Sometimes it does, sometimes it doesn't. To some people, the sixth period consits of only seventeen elements: cesium, barium, hafnium, tantalum, tungsten, rhenium, osmium, iridium, platinum, gold, Mercury, thallium, lead, bismuth, polonium, astatine, and radon, with a gap between barium and hafnium for the lanthanides. Also, it can have eighteen elements, with the gap filled in by lanthanum. Still, it can have thirty two. This is the same for period 7, francium, radium, a gap, rutherfordium, dubnium, seaborgium, bohrium, hassium, meitnerium, darmstadtium, roentgenium, copernicium, ununtrium, flerovium (or ununquadium), ununpentium, livermorium (or ununhexium), ununseptium, and ununoctium. With eighteen elements, the gap is filled in with actinium. Then, it can have Fr, Ra, actinides, Rf, Db, Sg, Bh, Hs, Mt, Ds, Rg, Cn, Uut, Fl (or Uuq), Uup, Lv (or Uuh), Uus, and Uuo.

User Avatar

Wiki User

13y ago

What else can I help you with?