What is the trend for ionization energy across a period in the periodic table?
Answer Details
The trend for ionization energy across a period in the periodic table is that it increases from left to right.
Ionization energy is the energy required to remove an electron from an atom or ion. When moving from left to right across a period, the number of protons in the nucleus increases, which means there is a stronger attractive force on the electrons. As a result, it becomes more difficult to remove an electron and the ionization energy increases.
Therefore, the correct option is that the ionization energy increases from left to right across a period in the periodic table.