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2. Template:Periodic table - Wikipedia

   en.wikipedia.org/wiki/Template:Periodic_table

   Learn to edit; Community portal; Recent changes; Upload file; Search. ... Download as PDF; ... This periodic table is the prime form presented at this English wikipedia.

3. Periodic trends - Wikipedia

   en.wikipedia.org/wiki/Periodic_trends

   The energy released when an electron is added to a neutral gaseous atom to form an anion is known as electron affinity. [14] Trend-wise, as one progresses from left to right across a period , the electron affinity will increase as the nuclear charge increases and the atomic size decreases resulting in a more potent force of attraction of the ...

4. Extended periodic table - Wikipedia

   en.wikipedia.org/wiki/Extended_periodic_table

   This is an accepted version of this page This is the latest accepted revision, reviewed on 27 January 2025. Periodic table of the elements with eight or more periods Extended periodic table Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium ...

5. Annual cycle - Wikipedia

   en.wikipedia.org/wiki/Annual_cycle

   Mathematically, the climatological annual cycle is commonly estimated from observational data or model output by taking the average of all Januaries, all Februaries, and so forth. If the observational record is long enough and conditions are stationary (i.e. there is no significant long-term trend), a meaningful annual cycle will result that ...

6. History of the periodic table - Wikipedia

   en.wikipedia.org/wiki/History_of_the_periodic_table

   This is an accepted version of this page This is the latest accepted revision, reviewed on 28 January 2025. Development of the table of chemical elements The American chemist Glenn T. Seaborg —after whom the element seaborgium is named—standing in front of a periodic table, May 19, 1950 Part of a series on the Periodic table Periodic table forms 18-column 32-column Alternative and extended ...

7. List of solar cycles - Wikipedia

   en.wikipedia.org/wiki/List_of_solar_cycles

   Solar cycles are nearly periodic 11-year changes in the Sun's activity that are based on the number of sunspots present on the Sun's surface. The first solar cycle conventionally is said to have started in 1755.

8. Mendeleev's predicted elements - Wikipedia

   en.wikipedia.org/wiki/Mendeleev's_predicted_elements

   To give provisional names to his predicted elements, Dmitri Mendeleev used the prefixes eka- / ˈ iː k ə-/, [note 1] dvi- or dwi-, and tri-, from the Sanskrit names of digits 1, 2, and 3, [3] depending upon whether the predicted element was one, two, or three places down from the known element of the same group in his table.

9. List of periodic comets - Wikipedia

   en.wikipedia.org/wiki/List_of_periodic_comets

   Periodic comets (also known as short-period comets) are comets with orbital periods of less than 200 years or that have been observed during more than a single perihelion passage [1] (e.g. 153P/Ikeya–Zhang). "Periodic comet" is also sometimes used to mean any comet with a periodic orbit, even if greater than 200 years.