For each pair of elements, choose and then fill in the blank with the element that has the higher first ionization energyO or Ne

To determine which element has the higher first ionization energy, we need to compare the elements O and Ne.

Step 1: Look up the atomic numbers of O and Ne. The atomic number of O is 8, and the atomic number of Ne is 10.

Step 2: Recall that ionization energy is the energy required to remove an electron from an atom. Generally, ionization energy increases as you move across a period from left to right in the periodic table.

Step 3: Since Ne has a higher atomic number than O, it is located to the right of O in the periodic table. Therefore, Ne has a higher first ionization energy than O.

Step 4: Fill in the blank with Ne, as it has the higher first ionization energy compared to O.