The number of energy levels increases from top to bottom of a group. So the electrons are easy to remove. So the ionization energy decreases.
The ionization energy decrease moving down in a group.
The trend in ionization energy generally increases across a period from left to right due to increasing nuclear charge. Within a group, ionization energy tends to decrease from top to bottom due to increasing atomic size.
Exceptions in ionization energy within the periodic table occur when there is a significant decrease in ionization energy going from one element to the next. This can happen when there is a half-filled or fully-filled subshell, which results in increased stability and lower ionization energy. Examples include the group 3 elements (B, Al, Ga, In, Tl) and the group 6 elements (Cr, Mo, W).
there is an increase in atomic number and atomic size down the group due to addition of extra shells.this increase in the atomic size overcomes the effect of an increase in the nuclear charge.Therefore ionisation energy decreases with an increase in atomic size i.e.,it decreases as one moves down a group..
As you go from right to left in a period in the periodic table the ionization energy increases. While going from top to bottom in a group in the periodic table the ionization energy decreases .
Within a group, first ionization energy generally decreases as you move down the group due to increasing atomic size and shielding effects. Across a period, first ionization energy generally increases due to increasing nuclear charge and effective nuclear charge. For example, within Group 2 (alkaline earth metals), the first ionization energy decreases as you move down the group from Be to Ra. Across Period 3, the first ionization energy increases from Na to Cl.
as atomic number is increase the size of the atom goes on increasing as more number of electron is added to the outer most orbit so the nuclear force exerted by the nucleus on electron is less so the affinity to loose electorn is more as the atomic number is increase that is the reason ionization energy decrease with increase in atomic number
Within a group, first ionization energy generally decreases as you move down because the atomic size increases and the outermost electron is farther from the nucleus, making it easier to remove. Across a period, first ionization energy generally increases due to increased nuclear charge, which attracts electrons more strongly and requires more energy to remove an electron.
Helium (He) has the highest ionization energy, then Neon (Ne) Ionization energy increases as you go across a period from left to right. Ionization energy decreases as you go down a group. Therefore, elements in the upper right of the periodic table have the highest ionization energy.
None of them do exactly. The elements' ionization energies definitely trend in a couple of ways though. The ionization energy variations tend to decrease as atomic number goes up and tend to increase as you remove more electrons from the atom.
As one proceeds down the group 7A elements, the first ionization energy decreases. this means that the outermost electron is more readily removed as we go down a group.
Noble gases have the highest first ionization energies because they have a full valence shell, making it difficult to remove an electron. Within a period, ionization energy generally increases from left to right due to increasing nuclear charge.