the.com/periodic
The universe's habit of repeating itself until you finally pay attention.
means Happening at regular, recurring intervals; occurring again and again in a predictable cycle.
from From the Greek 'periodos' — 'peri-' (around) plus 'hodos' (a way or road) — literally a going-around, a journey that loops back to its start. The Greeks used it for cycles of time and the returning paths of heavenly bodies; it traveled through Latin 'periodus' and into English, where by extension a 'period' became any stretch of time that comes round again, and 'periodic' the adjective for whatever keeps making that same circuit.
- table origin
- Mendeleev arranged elements partly from a dream
- left gaps
- He predicted elements that didn't exist yet
- math root
- From Greek 'periodos,' meaning a way around
- decimals too
- 1/7 repeats forever as 0.142857
- comet timing
- Halley returns roughly every 76 years
periodic table of elements — mendeleev's 1869 classification of 118 known chemical elements by atomic number and properties
periodic motion — pendulum swinging at constant frequency, or earth's orbit repeating every 365.25 days