how does ionization energy change in a group?
Answers
In general, ionization energy increases across a period and decreases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant. ... Down a group, the number of energy levels (n) increase and the distance is greater between the nucleus and highest-energy electron.
Within a group, the ionization energy decreases as the size of the atom gets larger. On the graph, we see that the ionization energy increases as we go up the group to smaller atoms. In this situation, the first electron removed is farther from the nucleus as the atomic number (number of protons) increases.
Explanation:
moving from left to right along a group in the periodic table, ionisation energy decreases because atomic size decreases
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