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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..

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Q: Why does the ionization energy tend to decrease from top to bottom within a group?
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In ionization energy how does the property varies within a group?

The ionization energy decrease moving down in a group.


Why does ionization energy tends to decrease from top to bottom within a group?

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.


Why does the radius of an atom decrease as you move from left to right across the periodic table within the same energy level?

That's how Mendeleev first assorted it. There's no other answer I could think of anything else.


What accounts for the general trend in the first ionuization energy of the elements within a period?

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 .


How does the ionization energy vary with atomic number within the group?

Ionization energy decreases with the rise of atomic number in a group of periodic table.


Describe the trends in first ionization energy within groups and across periods in the periodic table Provide examples?

When moving left to right across the PT the ionization energy increases. As you go down, the ionization energy, decreases.


What are the element within any giving periodic table would always have the lowest first ionization energy?

Francium in group 1 has the lowest first ionization energy.


What is the relationship between elements and the periodic table and ionisation energy?

The relationship between atomic numbers and first ionization energies is that within the same period, as atomic number increases so does first ionization because as nuclear charge increases and atomic radius decreases, electrons become harder to remove. However, within the same group, the first ionization energy decreases as atomic number increases because of the added energy level, the electrons are farther from the nucleus and easier to remove.


What are the trends in first ionization energy within groups and across periods in the periodic table?

First ionization energy: if you are looking at your periodic table, start from the bottom left corner at Francium in period 7 group 1, then draw a line to helium group 8 period 1. That line represents increasing first ionization energy. Basically it increases going to the right and increases going up Think of the positive slope line y=x on a graph starting at the origin (of Fr in this case) going all the way to He.


What factors contribute to the decrease in ionization energy within a group in the periodic table as the atomic number increases?

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


What is the Trend in first ionization energy across a period?

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.


Is it true or is it false Ionization energy is a measure of the ability of atoms to attract electrons within a bond?

True