Which element has 2 electrons in the outermost energy level?

Answer 1

Look at the Periodic Table. All the numbers in the 1st column (Group 1) have 1 electron in their outermost energy level. All the numbers in the 2nd column (Group 2) have 2 electron in their outermost energy level. That would be elements such as Be (Beryllium), Mg (Magnesium), Ca (Calcium) and so forth.