The formula H₂O shows that water is made from two atoms of hydrogen (H) bonded to one atom of oxygen (O). Katie: Time for some science. And today it's a chemistry classic, the periodic table. And here ...

We're celebrating the 150th anniversary of the periodic table. Join us as we tour the cosmos, from the microscopic to the telescopic, with four scientists studying the role of four elements—zinc, ...

Your article on attempts to improve the layout of the periodic table was interesting (2 March, p 36). But I am not holding my breath for anything to come of it, any more than I was after your previous ...