4th Period: Potassium and Calcium—Electrons go into the fourth energy level. A small piece of sodium metal is placed in water. The sodium reacts with the water and gets very hot, producing sodium ...

An alternative periodic table of elements focusing on highly charged ions reveals new science that could support the quest ...

The modern periodic table is based closely on the ideas he used ... all have the same kind of reaction with water. The group of elements below were grouped together because they tended to combine ...

Scientists have discovered the elusive properties hidden within promethium, a rare earth element that has remained largely ...

Accompanying Lesson Plan: Lesson 3.2: Finding Volume—The Water Displacement Method The chart shows that atomic size and mass for the first 20 elements in the periodic table. The size of the atoms and ...

Test your knowledge and compete with other Live Science readers to see who can come top in our periodic table quiz. The ...