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Completely filled s orbital is more stable than half filled s orbitals and it is difficult to remove electrons from the former due to extra stibility. Group IIA elements (or alkaline earth metals) have completely filled s orbitals, whereas group IA elements have half filled s orbitals.

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Q: Why the ionization potential of 2-A group is more than the ionization potential of 1-A group?
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Related questions

Why are the elements in group 1 more reactive than the other groups?

Causes: very low ionization potential, very great electropositivity.


Which is more reactive sodium or barium?

sodium because it's the first group and first group are the most


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It takes more energy to knock off two electrons


Why 2nd ionization potential is greter than 1st ionisation potential of element?

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Why arsenic has larger ionization potential than cesium?

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Imagine that one electron has already been removed from an atom, the energy used to accomplish this is the 1st ionization energy. Now more energy is needed to remove a 2nd electron. That is the 2nd ionization energy.


What is niobium's ionization energy?

Niobium element has more than one electron to be removed, it will have more than one ionization Energy (IE) 1st ionization energy: 652.1 kJ mol-1,2nd ionization energy: 1381.7 kJ mol-1,3rd ionization energy: 2416 kJ mol-1


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Within the alkali metals, or group 1, the ionization energy trend is that ionization energy decreases as you move down the group from top to bottom. This is because with each step down, you add an energy level, therefore the one valence electron is farther and farther from the atom's nucleus. So, the attraction between the nucleus and that electron (its electronegativity) decreases. This makes it easier (requires less energy), making the element more reactive. For example, cesium is more reactive than rubidium, which is more reactive than potassium, which is more reactive than sodium...


Which has more ionizastion energy n2 or no?

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Is cathode rays have maximum ionising power than alpha beta gamma rays?

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