Given the question: A high school student, Timmy, is reading about elements of a periodic table. He is studying the periodic table when he decides to compare two random elements within the same column. He chooses Mardine and Sampline to compare and contrast and gets to work. The first thing he notices is that Sampline is further down the periodic table than Mardine. It's not much information to go on, but it's a good starting point for Timmy. Is electron shielding higher or lower in Mardine?
The answer is:
lower