Which element has the highest electronegativity?

Electronegativity is a measure of the tendency of an atom to attract electrons from neighboring atoms within a molecule. The American chemist Linus Pauling established the first electronegativity scale. He arbitrarily assigned the value 4.0 to the atom with the highest electronegativity (fluorine).
Among the main group elements, the electronegativity increases within a main group with decreasing atomic radius (from bottom to top) and increases within a period with increasing atomic number (from left to right).
H
2,2
      
Hey
-
Li
1,0
Be
1,6
B.
2,0
C.
2,6
N
3,0
O
3,4
F.
4,0
No
-
N / A
0,9
Mg
1,3
Al
1,6
Si
1,9
P.
2,2
S.
2,6
Cl
3,2
Ar
-
K
0,8
Approx
1,0
Ga
1,8
Ge
2,0
As
2,2
Se
2,6
Br
3,0
Kr
-
Rb
0,8
Sr
0,9
In
1,8
Sn
2,0
Sb
2,1
Te
2,1
I.
2,7
Xe
-
Cs
0,8
Ba
0,9
Tl
2,0
Pb
2,3
Bi
2,0
Po
2,0
At
2,2
Marg
-

The concept of electronegativities is not physically exact, but offers a good opportunity to make qualitative statements when comparing different elements. For example, one can see from the electronegativity that a hydrogen fluoride molecule (HF) forms a stronger dipole than a hydrogen chloride molecule (H-Cl), since fluorine has a higher electronegativity than chlorine and therefore more strongly attracts the bonding pair of electrons from hydrogen than chlorine does can.