It's hard to imagine today, but when scientists introduced the periodic table, it was merely a conjecture. It had to fight for attention and defend itself against attacks, and could easily have been ...

There are many different versions of the periodic table, but one among them reigns supreme. Michelle Francl ponders on why chemists put elements in boxes. The postcard to me began '53 90.8.92.g.1.t'.

CBSE Class 10 Science Extra Questions and Answers for Chapter 5 - Periodic Classification of Elements are available here for free PDF download. All these questions and answers are prepared by the ...

Every field of science has its favorite anniversary. For physics, it’s Newton’s Principia of 1687, the book that introduced the laws of motion and gravity. Biology celebrates Darwin’s On the Origin of ...