noble gases
halogens
Atoms with the lowest electronegativity values located on the leftmost part of the periodic table. The atom with the lowest electronegativity belongs to Francium.
Electronegativity is a measure of an atom's ability to attract electrons towards itself in a chemical bond. It increases across a period from left to right and decreases down a group in the periodic table. Elements with high electronegativity tend to form negative ions, while elements with low electronegativity tend to form positive ions in chemical compounds.
The elements with low electronegativity are the metals, specifically the alkali metals and alkali earth metals. The elements further to the left of the periodic table will have lower electronegativity than those farther to the right.
Noble Gases
Far right in group 18, the noble gases
Atoms with the lowest electronegativity values located on the leftmost part of the periodic table. The atom with the lowest electronegativity belongs to Francium.
Electronegativity is a measure of an atom's ability to attract electrons towards itself in a chemical bond. It increases across a period from left to right and decreases down a group in the periodic table. Elements with high electronegativity tend to form negative ions, while elements with low electronegativity tend to form positive ions in chemical compounds.
The elements with low electronegativity are the metals, specifically the alkali metals and alkali earth metals. The elements further to the left of the periodic table will have lower electronegativity than those farther to the right.
The electronegravity decreases as you go down the periodic table. As you go down the columns in the periodic table the atoms get bigger because there are more full shells of electrons (although the number electrons in the OUTER shell always stays the same for each element in the group). so because there are more shells the outer shell of electrons becomes increasingly further away from the nucleus this means they are shielded from the attractions of the positive nucleus' pull by the increasing number of inner shells. hope this was the answer you were looking for and that it made sense.
The most reactive metals are in the group 1 of the Periodic Table - the alkali metals.
Noble Gases
You look up the elements involved on a periodic table, if there is a low electronegativity difference between them and if they are both nonmetals it is so. (Electronegativity decreases when you go left, increases when you go down)
They are in the group II of the periodic table, they are metals, they have a low density, they have the valence 2.
Far right in group 18, the noble gases
Vinidium (V) atomic number 23 is the lowest electropositive element in this group.
This is a noble gas (group 18).
potassiumLooking at the periodic table, draw an imaginary line from the bottom left towards the top right. Electronegativity increases in this direction. Francium (Fr) and Cesium (Cs) have very low electronegativity. Fluorine (F) has extremely high electronegativity. Another way to look at it is electronegativity increasing from left to right and from bottom to top.Electronegativity corresponds with how strong a pull the nucleus of an atom has on electrons. They attract the bonding electrons of other atoms.Electronegativity increases from left to right across a period and decreases from top to bottom in a group. According to the Wikipedia article "Electronegativity" the element with the lowest electronegativity is francium at 0.7 on the Linus Pauling Scale.Please click on the related link below for more information.Francium(Fr) has lowest electronegetivity. It is at the Bottom left corner of periodic table.