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C. Be. Beryllium.

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Q: Which atom requires the least energy for the removal of the most loosely bound electron a.Sn b.Sr c.Be d.Br?
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Why the addition of two electrons or removal of one electron requires more energy in oxygen atom?

Adding electrons to an oxygen atom requires more energy because its electron shells are already filled and adding more electrons would create repulsion due to increased electron-electron interactions. Removing an electron requires more energy because oxygen has a strong attraction to electrons due to its high electronegativity, making it difficult to remove an electron.


What requires the removal of thermal energy?

Cooling and freezing.


Does boiling require the removal of energy?

No. It takes energy to boil a substance.


Does the addition of two electrons or removal of one electron require more energy for an oxygen atom?

when adding two electrons to the oxygen atom yep! it requires more energy because it has to take them from another atom so it will be removing an electron using more ionization energy to do the work.and we must remember that oxygen needs two electrons to attain its valency then it needs to take two from another atom to be fully filled and without the two electrons it will still lack electron to be stable.this means adding or removing requires energy.


Why Cesium atomic number 55 requires little energy to release its one electron present in the outer most shell?

why Cs requires little energy to release its 1 electron


Why is the 2nd ionisation energy of Cr higher and not lower than of Mn?

The electron configuration of a neutral chromium atom is [Ar]3d54s1. The electron configuration for manganese is [Ar]3d54s2. The first electron removed from a chromium atom is the single 4s electron, leaving the electron configuration [Ar]3d5. The first electron removed from a magnesium atom is one of the 4s2 electrons, leaving the electron configuration [Ar]3d54s1. Removal of a second electron from a chromium atom involves the removal of one of the 3d electrons, leaving a configuration of [Ar]3d4, which is not a very stable configuration, and requires more energy to achieve. Removal of a second electron from a magnesium atom involves the removal of the second 4s electron, leaving a configuration of [Ar]3d5, which is more stable and requires less energy to achieve.


Why na and mg have same number of electrons but removal of electron from mg requires more energy?

na is more electropositive. it is so as electropositivity decreases from left to right across a group


Why formation of do negative ion is an endothermic process?

endo process because it involves breaking of bonds ( requires energy thus energy from surroundings are absorbed)


Why does Be have a much larger second ionization energy than the first?

Beryllium has a much larger second ionization energy than the first because after losing its first electron, the remaining electron is held more tightly due to increased electrostatic attraction from the positively charged nucleus. This results in a higher energy requirement to remove the second electron.


Is atoms with high ionization energy allow their electrons to be easily taken?

This is false. The ionization energy is the amount of energy that is required to remove the electron. Therefore, if it requires more energy, it is harder to remove the electron.


Is it true that A change of state requires the addition or removal of heat energy?

Yes, that's correct.


What is the energy of electron in nth orbit in hydrogen atom?

It depends on which energy level the electron is in, and where it ends up. To go from n=1 to n=2, it requires 10.2 eV of energy.