You’ve probably heard of the chemical calcium in milk. But calcium shows up in lots of other stuff too. For example, the hard part of your bones and teeth is made from calcium connected to a chemical ...

Players read questions about energy levels and score points by picking the correct element as the answer ... 4th Period: Potassium and Calcium—Electrons go into the fourth energy level. A small piece ...

since calcium is a very common element and so contamination of the experiments was a constant problem. At the same time, a group of theoretical chemists from the University of Bayreuth led by ...