The sixth period is currently known as the longest period because it has the most number of elements in it if you include the inter transition metals which are normally found in 2 columns at the bottom of a Periodic Table.
A period of six months is called half a year.
Pluto has the longest REVOLUTION period Venus has the longest ROTATION period
A sexennium is a period of six years, but this word is rarely used. Saying 'six years' is more common.Sexennial means (i) happening every six years, or (ii) something which happens over a six year period.See Related links below for references.
Paleozoic Period
The longest period is the sixth period, which contains thirty-two elements total.
the longest period of darkness in July is in the what zone?
Albie Morkel hit 125 m six longest in the ipl for CSK
Kevin o'brien hit the longest six in this world cup 2011
longest six in history of cricket by the criss gyle from west indies
6th and 7th period are the longest period of the perodic table
Yuvraj Singh hit the world's longest six in ipl 2009.
The Cretaceous Period was the longest period of time.