Astudent walks for 2.0 hours and travels 5.0km. what is the average speed of the student?

What elements have 2 electrons inthe 4s sublevel

Complete the table for ion charge based upon their losing or gaining electrons in the outer shell. (use the periodic table as necessary.) group most likely ionic charge # of valence electrons i +1 ii +2 iii +3 iv +4 or -4 v -3 vi -2 vii -1 viii 0

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom