2007-12-20 08:24:35 · 4 answers · asked by fast and furious 1 in Science & Mathematics ➔ Chemistry
as you know that the ionization energy is that amount of energy that required to remove the most outer electron at any atom
and as you know that electron with a negative charge and nuclie has a positive charge and there are attraction between both of them
from group 1 to group 8 A as known that the size of the atom is getting in increase and it is because the number of electron increase while the number of the shilding orbitals still as it ... so since the size of atom is getting in increase that means that the space between the most outer electron in a group in group 1 A and it is nucles is lower than the space between the most outer electron and it is nuclis in an element of group 8A
this means that the attraction force between nuclis and most outer electron in group 1A elements is more than group 2A and group 2A is more than 3A and so on .... (Due to the size change)
and since the electron attraction force increase that means that it will need a higher amount of energy to get free ( in other words it will need a higher ionization energry to get free)
2007-12-20 08:36:10 · answer #1 · answered by ch_yaso 2 · 1⤊ 0⤋
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RE:
why does the ionization energy increase from group 1 to group 8A of the periodic table?
2015-08-18 14:42:39 · answer #2 · answered by Kathye 1 · 0⤊ 0⤋
The question is incorrect, ionization energy does NOT increase with group number:
Ionization energy, kJ/mol
Na 496
Mg 738
Al 577
Si 786
P 1,060
S 999.6
Cl 1,256
Ar 1,520
Note that energy for Al and S is lower then prev element
2007-12-20 08:34:11 · answer #3 · answered by Alex 4 · 2⤊ 0⤋
Because there is a shielding effect of a filled shell. Take Li, for example. 1s2 2s1. Ionization takes one electron from the 2s, while an effective charge of only 1+ tries to hold it back. By the time you get to VIIA, F, there is an effective charge of 7+ trying to pull it back.
2007-12-20 08:33:25 · answer #4 · answered by steve_geo1 7 · 0⤊ 0⤋
As you go from left to right on the periodic table, there are more protons in the nucleus, but the electrons still arrange themselves into the same shells. Therefore, the electrons are drawn closer to the larger positive charge in the nucleus as you go across the table, making it more difficult to pull an electron off of the atom.
2007-12-20 08:30:42 · answer #5 · answered by The Frontrunner 5 · 0⤊ 0⤋
Core charge of the atoms increases that way. therefore, the are pulled closer together (atomic radius decreases). This means that it takes more energy to remove a valence electron. (aka: ionization)
2007-12-20 08:49:06 · answer #6 · answered by Anonymous · 0⤊ 0⤋
it generally decreases while moving down a group.
2016-03-24 05:10:24 · answer #7 · answered by Anonymous · 0⤊ 0⤋