Which statement is true about electron shielding of nuclear charge?a) Outermost electrons efficiently shield one another from nuclear charge.b) Core electrons efficiently shield one another from nuclear charge.c) Outermost electrons efficiently shield core electrons from nuclear charge.d) Core electrons efficiently shield outermost electrons from nuclear charge.

Explain the phrase effective nuclear charge. How is this related to the shielding effect?

Write the electron configurations for the elements below: Germanium  Zirconium

this question has two parts A and B. Part A: How does atomic radius change going down the group and why? Decreases because there are less energy levels decreases because the nucleus is stronger Increases because more energy levels are being added down the group Increases because the nucleus is weaker Part B: How does atomic radius change moving across the period? Increases because there are more energy levels Increases because the nucleus is less efficient (weaker) Decreases because the nucleus is stronger and more efficient Decreases because there are less energy levels