Final answer:
As the molar mass increases, the valence electrons are closer to the nucleus.
Step-by-step explanation:
As the molar mass increases, the valence electrons are closer to the nucleus.
This is because as the molar mass of an element increases, the number of electron shells also increases. However, the outermost shell, which contains the valence electrons, remains relatively unchanged in size. Since the valence electrons are in the same shell, they are closer to the nucleus.
For example, let's consider the elements in Group 1 of the periodic table. As you move down the group, the molar mass increases, while the number of valence electrons remains the same. This means that the valence electrons are closer to the nucleus in the heavier elements of the group.
Learn more about molar mass and valence electrons