According to the results, a calcium cation—a positively charged calcium ion—is located at a distance of less than 0.7 nanometers from the iron atoms the protein uses to store electrons. Even ...

A standard calcium model overestimates how strongly calcium binds, leading to clumps of ion pairs (left). An intermediate model shows less clumping (middle), and a refined charge-scale model ...

The positive and negative ions attract each other and form the ionic compound sodium chloride. One calcium and two chlorine atoms are near each other. An electron from each atom feels the attraction ...

For instance, potassium can be replaced by cations such as calcium or hydrogen, and vice versa. The total number of cations a soil can hold--or its total negative charge--is the soil's cation exchange ...

4. Write the charge of each ion. Here are some other examples of dot and cross diagrams for the formation of ions in some ionic compounds – magnesium oxide and calcium chloride.