Players read questions about energy levels and score points by picking the correct element as the answer ... energy level and six electrons on the second energy level. Since this atom has a total of ...

Group 1 elements react with moist air. They are stored in oil to stop air and water vapour coming into contact with them. Moist air reacts with potassium to form potassium oxide. This creates a ...

For example, lithium (Li), sodium (Na) and potassium ... group of elements below were grouped together because they tended to combine with two other atoms. For example, one oxygen atom combines ...