The outer electrons in bigger halogens are further from the nucleus and so they feel less attraction and so are easier to remove. Therefore, astatine has the lowest ionisation potential of the halogens.
Within the halogen, At, or Astatine has the least negative electron:
Referring back to general trends of the electron affinity.
Electron affinity: is the measurement of how steadily the process of atoms gaining electrons and then forming negative ions.
So as you move down a group the distance from the nucleus out shell increases and the electron shield increase, so the electron affinity decreases.
When moving across a period the nuclear charge increases thus a stronger attraction force increases so EA tends to increase.
Astatine is the halogen with the lowest electronegativity.
The halogen with the least negative electron affinity is Fluorine. Fluorine has the highest electron affinity of any element and is also the most electronegative.
iodine
Iodine.
2
Helium has the highest first ionization energy and francium has the lowest first ionization energy.
Fluorine has the largest first ionization energy among the halogens.
Francium in group 1 has the lowest first ionization energy.
Sodium
It is the energy required to remove the 1st electron from the atom
Helium has the highest first ionization energy and francium has the lowest first ionization energy.
Fluorine has the largest first ionization energy among the halogens.
On the periodic table, the first halogen (the one with the lowest atomic number) is fluorine (F).
Francium in group 1 has the lowest first ionization energy.
There is no relation ship. They have the lowest ionization energies.
Sodium
It is the energy required to remove the 1st electron from the atom
Nitrogen has the highest first Ionization potential.
Ne (Highest First Ionization Energy) C Be Mg Sr (Lowest First Ionization Energy)
the alkaline metals
strontium
Roughly, first ionization potential and electron affinity.