Question

element atomic radius electronegativity sr 255 pm 0.95 rb? ? 9. based on periodic trends and the data in the table above, which of the following are the most probable values of the atomic radius and the electronegativity of rb, respectively?

Explanation:

Step1: Recall periodic - trends

Atomic radius increases down a group and decreases across a period. Electronegativity decreases down a group and increases across a period. Sr (strontium) and Rb (rubidium) are in the same period, and Rb is to the left of Sr.

Step2: Analyze atomic - radius

Since Rb is to the left of Sr in the same period, Rb has a larger atomic radius than Sr. Given Sr has an atomic radius of 255 pm, Rb's atomic radius should be larger than 255 pm, likely around 290 pm.

Step3: Analyze electronegativity

Since Rb is to the left of Sr in the same period, Rb has a lower electronegativity than Sr. Given Sr has an electronegativity of 0.95, Rb's electronegativity should be lower, likely around 0.82.

Answer:

290 pm, 0.82