Question

question 4 arrange the following from lowest ionization energy to highest ionization energy: br, ca, kr

Explanation:

Step1: Recall ionization - energy trend

Ionization energy increases across a period from left - to - right.

Step2: Locate elements on periodic table

Br (bromine), Ca (calcium), and Kr (krypton) are in the same period (Period 4). Ca is in Group 2, Br is in Group 17, and Kr is in Group 18.

Step3: Arrange elements

Based on the left - to - right increase in ionization energy across a period, the order from lowest to highest ionization energy is Ca < Br < Kr.

Answer:

Ca, Br, Kr