Question

23 multiple choice 1 point
which element has the highest ionization energy?
yellow
purple
orange
green

Explanation:

Step1: Recall ionization energy trend

Ionization energy generally increases across a period (left to right) and decreases down a group (top to bottom) in the periodic table.

Step2: Analyze positions of elements

• Green: Likely in Group 1 (alkali metal, low ionization energy).
• Purple: Lower period (down a group, lower IE than upper elements).
• Yellow: Lower period and right but not topmost.
• Orange: In the top-right region (noble gas or halide, high IE). Among the options, orange is in the topmost and rightmost region (closer to noble gas area), so it has the highest ionization energy.

Answer:

C. orange (assuming orange is the third option, but based on the analysis, the correct option is the one with orange, so: orange (the option labeled "orange"))