Question

1. going from left to right in the periodic table, the atomic radius decreases. which of the following explains the atomic radii trend of elements across a period? the attraction decreases between the nucleus and the outer electrons. the attraction increases between the nucleus and the outer electrons. there is a decrease in the number of electron shells. there is an increase in the number of electron shells.

Explanation:

As you move from left - right across a period in the periodic table, the number of protons in the nucleus increases (nuclear charge increases), while the number of electron shells remains the same. This leads to a stronger attraction between the nucleus and the outer - shell electrons, pulling the electrons closer to the nucleus and decreasing the atomic radius.

Answer:

The attraction increases between the nucleus and the outer electrons.