Question

click on the element in the periodic table to explore the atomic radii of elements from period 3 and group 17. fill in the missing values in the table so you can compare the atomic radii of the elements. after the table is filled in, compare the values in each column. a = b = c =

Explanation:

Step1: Recall atomic - radius trends

Atomic radius generally decreases across a period and increases down a group. Chlorine (Cl) and Bromine (Br) are in Group 17. Since Br is below Cl in the periodic table, its atomic radius is larger than that of Cl. The atomic radius of Bromine is approximately 1.14 Å.

Step2: Consider elements in Period 3

Magnesium (Mg) and Sodium (Na) are in Period 3. Atomic radius decreases from left - to - right across a period. Sodium is to the left of Magnesium, so the atomic radius of Sodium is larger than that of Magnesium. The atomic radius of Magnesium is approximately 1.30 Å and that of Sodium is approximately 1.54 Å.

Answer:

A = 1.14
B = 1.30
C = 1.54