9. which of the following explains why atomic radius decreases across a period? a) more shielding electrons…

9. which of the following explains why atomic radius decreases across a period? a) more shielding electrons are added b) electrons are lost c) nuclear charge increases, pulling electrons closer d) neutrons are removed 10. the largest atoms are usually found: a) top right of the periodic table b) bottom left of the periodic table c) top left of the periodic table d) bottom right of the periodic table

9. which of the following explains why atomic radius decreases across a period? a) more shielding electrons are added b) electrons are lost c) nuclear charge increases, pulling electrons closer d) neutrons are removed 10. the largest atoms are usually found: a) top right of the periodic table b) bottom left of the periodic table c) top left of the periodic table d) bottom right of the periodic table

Answer

Brief Explanations:

For question 9, as you move across a period, the number of protons (nuclear charge) increases while electrons are added to the same energy - level. The increased nuclear charge pulls the electrons closer, decreasing the atomic radius. For question 10, atomic radius increases down a group (due to addition of energy levels) and decreases across a period. So the largest atoms are found at the bottom - left of the periodic table.

Answer:

  1. c) Nuclear charge increases, pulling electrons closer
  2. b) Bottom left of the periodic table