Chalk is a fine-textured form of limestone. It is composed of several tiny fragments of the calcite shells or skeletons of ...

A lead-acid battery is a type of rechargeable battery, invented in 1859. It uses lead plates (electrodes) submerged in ...

In chemistry, the chemical nomenclature of ionic and molecular compounds uses a systematic approach of prefixes to indicate ...

For example, magnesium oxide is made up of two elements, magnesium and oxygen. Its formula is MgO. This shows that it has one atom of magnesium for every one atom of oxygen.

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 ...