Periodic Trends in Atomic Structure

Consider the following elements: Argon (Ar), Chlorine (Cl), Neon (Ne), and Bromine (Br). Analyze their electron configurations, atomic radii, and electronegativity. Given the periodic trends, which of the following statements is true regarding these elements?

Remember that atomic radius generally increases down a group and decreases across a period, while electronegativity tends to increase across a period and decrease down a group.