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Ionization energy is how much energy is needed to remove an electron from the valence shell (the outermost shell). When the atomic radius is smaller, you will need more energy to remove an electron because the pull from the nucleus on the electron is stronger. If the atomic radius is larger, then it will be much easier to remove an electron from the valence shell because there are more layers (shieldings) between the nucleus and valence shell.

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Q: Why does ionization energy increase as atomic radius decreases?
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Related questions

Why ionization energy of hydrogen is greater then lithium?

due to increase in atomic number,the ionization energy decreases within a group. therefore hydrogen has grater ionization energy than lithium.

Relationships between Atomic radius and first ionization energy?

Atomic radius is inversely proportional to first ionization energy. As atomic radius increases, first ionization energy decreases.

AS you go down a group the first ionization energy generally increase or decreases?

The First Ionization Energy generally decreases.

How can you determine whether ionization energy is a periodic function of atomic number?

as atomic number increases, ionization energy also 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.

What is the trend for ionization energy as the atomic number increases within a group?

As the atomic number increases within a group, the ionization energy decreases .

How are atomic radii and ionization energy related?

Atomic radius is inversely proportional to first ionization energyAs Atomic radius INCREASE, Ionization energy DECREASE

Why does ionization energy decrease down?

Ionization energy decreases down due to increase in shielding effect.

What decreases with increasing atomic number in Group 2A?

Ionization energy

What noble gas has the least ionization energy?

Radon (as down a group, the atomic size increases and the ionization energy decreases)

How do the trends in atomic radius compare with the trends in ionization energy?

as atomic radius increases, ionisation energy decreases.

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

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..

Does ionization energy decrease as you go from left to right on the periodic table?

No, ionization energy increase when we move from left to right (in a period) in periodic table, because atomic size decreases and nuclear charge increases.

What decreases with increasing atomic number in group 2a of the periodic table?

ionization energy

Increasing ionization energy Li Cs K?

Ionization energy increase from left to right. Ionization decreases going down a cloumn. Answer= Cs, K, Li

What happens as we move down columns on the periodic table?

As you move down a column (group) in the periodic table, the electronegativity decreases, the ionization energy decreases, the electron affinity decreases, and the atomic radius increases.

Why is the ionization energy of oxygen greater than chlorine?

because chlorine has larger size than oxygen and ionization energy decreases with increase in size

Does ionization increase or decrease across the periodic table?

Ionization energy increases as we go across a period and decreases as descend in a group.

What is the correlation of ionization energies to atomic radii for the elements?

In a group the ionization energy decrease when the atomic radius increase; in a period this relation is not generally valid.

What happens when the nuclear charge increases across a period?

The atomic size decreases (with some exceptions) , the ionization energy , electronegativity and electron affinity also increase from left to right.

Relationship between atomic size and ionization energy?

More the atomic size lesser ionization energy.

Is sodium reactive?

Yes, it is. Use the following as a general rule for metals. In a period, reactivity for metals will decrease when atomic number increases becasue the ionization energy increase. In groups, reactivity of metals increases because the ionization energy decreases. Source:

Who has the greater ionization energy Li or F?

Ionization energy increase across a period and decreases down a group, therefore the the element with the greater ionization energy would be found in the top right of the periodic table. In this instance fluorine, F would have the greater ionization energy.

Define the relationship between atomic numbers and first ionization energies?

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 happens to ionization energy when atomic number increases or decreases in a period?

IONIZATION ENERGYWhen it increases the energy level increases and the atoms start to vibrate more often, there is a state which is when crossed then the state of the body changes ....... and when the ionization energy decreases the vibration of the body and the energy also decrease so the state of the body changes again.