what is ionisation energy? how it vary in a group in a period?
Answers
Answer:
Moving left to right within a period or upward within a group, the first ionization energy generally increases. ... Conversely, as one progresses down a group on the periodic table, the ionization energy will likely decrease since the valence electrons are farther away from the nucleus and experience greater shielding
Answer:
Hii mate!
Ionisation energy is the amount of energy required to convert a neutral isolated gaseous atom into a positively charged ion.
The answer to the second part is:
In a period as you move from left to right IE increases.
In a group as you move from top to bottom IE decreases.
Explanation:
That means, if you want to remove an electron from the outermost shell of an atom for any purpose in order to make it a charged ion (positively charged) then you need to supply some energy to the atom and that amount of energy is called ionisation energy.
Explanation to second part is:
In a period from left to right, size of an atom decreases so the distance between outermost electron and nucleus decreases and a result and pulling force (Zeff) due to nucleus (positive charge) on electron (negative charge) increases and hence more amount of energy is required to remove the electron.
Same is the case with groups, as we move from top to bottom size of atom increases, so Zeff decreases and so it is easier to remove and electron as we move down the group.
I hope it is very clear to you.
If you have any further confusion, feel free to ask.