Monthly Archives: October 2014

Periodic Table Trends — The organization of the periodic table shows the periodic trends of six different physical properties of the elements: atomic radius, electron affinity, electronegativity, ionization energy, and metallic/nonmetallic character. Atomic radius is half the distance between two identical atoms touching each other. atomic radius increases as you move right to left […]

Periodic Table Trends

This entry was posted on October 31, 2014 by Todd Helmenstine (updated on August 31, 2022)

Guinea Pig eating apple — October 29 is Baruj Benacerraf’s birthday. Benacerraf was a Venezuelan-born American immunologist who discovered the genes which regulate the body’s immune response ability. Benacerraf spent much of his career studying hypersensitivity. Hypersensitivity is the immune response reactions caused by allergens. These reactions can range to the vaguely uncomfortable all the way to […]

Today In Science History – October 29 – Baruj Benacerraf ...

This entry was posted on October 29, 2014 by Todd Helmenstine (updated on October 29, 2018)

Happy Halloween! Here is a Periodic Table of Halloween wallpaper for your Halloween chemistry needs. 2015 Halloween Periodic Table The 2015 Halloween periodic table looks just like the original version, but it has updated atomic data. The PDF file for the new table is also available. 2014 Halloween Periodic Table Wallpaper This […]

Halloween Periodic Table Wallpaper

This entry was posted on October 28, 2014 by Todd Helmenstine (updated on September 12, 2015)

Black Arrow Rocket — October 28 is Jonas Salk’s birthday. Salk was an American physician best known for developing the first effective polio vaccine. Polio, or Infantile Paralysis, was an epidemic during most of the early 20th Century. One victim brought national attention to the disease by being President of the United States. President […]

Today In Science History – October 28 – Jonas Salk ...

This entry was posted on October 27, 2014 by Todd Helmenstine (updated on October 28, 2020)

Lise Meitner — October 27 marks the passing of Lise Meitner. Meitner was an Austrian physicist who was part of the group who discovered nuclear fission. Meitner became a physicist in spite of the challenges society put against her. The University of Vienna, who granted her doctorate did not allow women to attend […]

Today In Science History – October 27 – Lise Meitner

This entry was posted on October 27, 2014 by Todd Helmenstine (updated on May 13, 2023)

Igor Sikorsky 1914 — On October 26, 1959, people got the first look at the far side of the Moon. The “far side of the Moon” is a reference to the fact from Earth, you can only see about 59% of the Moon’s surface. This is due to the Moon’s rotational speed is matched […]

Today In Science History – October 26 – Far Side ...

This entry was posted on October 26, 2014 by Todd Helmenstine (updated on October 9, 2017)

Evangelista Torricelli — October 25 marks the passing of Evangelista Torricelli. Torricelli was the Italian mathematician and physicist who invented the barometer. Torricelli was sent as a young man to study under his uncle, a Camaldolese monk. Once he learned all his uncle could teach, his uncle arranged to have him educated at […]

Today In Science History – October 25 – Evangelista Torricelli ...

This entry was posted on October 26, 2014 by Todd Helmenstine (updated on June 17, 2021)

Tycho Brahe — October 24 is Antonie van Leeuwenhoek’s birthday. Leeuwenhoek was a Dutch cloth merchant who became known as the Father of Microbiology. At the age of 16, Leeuwenhoek was apprenticed to a cloth merchant when he was introduced to a magnifying glass apparatus used in the business. Once he began his […]

Today In Science History – October 24 – Antonie van ...

This entry was posted on October 25, 2014 by Todd Helmenstine (updated on September 29, 2017)

Cat Periodic Table ver2 White — EDIT: These wallpapers have been updated to correct the atomic weights of iron and gallium. The updated cat periodic table wallpapers can be found at Cat Periodic Table – 2015. This is an updated version of the original Periodic Table Wallpaper with Cats. This version of the periodic table with […]

Periodic Table Wallpaper With Cats – Updated Version

This entry was posted on October 24, 2014 by Todd Helmenstine (updated on April 22, 2015)