General Knowledge - Chemistry - Discussion

Electronegativity is defined as the phenomenon where the ability of an element to pull shared pair of electrons towards itself.

As we move across the group in the periodic table, electronegativity increases and as we move down the group it decreases. Flourine is the last element placed before noble gases in the periodic table. Its electron config is 1s22s22p5. Owing to its small atomic size (than oxygen) , flourine atom has a higher tendency to pull shared pair of electrons towards itself.

Fluorine have the tendency to accept the electron. It's outermost cell has 7electrons it need 1more electron to go for noble state so it accept one electron and after accepting the electron number of protons will be 9 and number of electron will be 10 then by subtracting protons and electrons of fluorine after accepting will be equal to -1so there will be formation of anion and the fluorine is electronegative element among them.

Fluorine is the most electronegative element among the given options Sodium, bromium and Oxygen because of among these elements fluorine has small element. As atomic size increases, nuclear attraction decreases, and therefore the electro negativity decreases. As we move from left to right in periodic table atomic size decreases then EN increases in 2nd period elements. The F - EN is 4.

F is the most electronegative element compare with other elements... due to
1.from L-R atomic size decreases, electronegativity increases because of nuclear attraction increases...
2.its e-configuration is 1S2 2S2 2P5... in p shell having 5e- it will be get another 1e- its formed octet(8e-) configuration as well as stable... so its easily attract e-.....

Fluorine is the correct answer.

Electronegativity increases across a period(left to right) and also decreases down a group.

So the general trend is diagonally across the periodic table from left to right(excluding the noble gases).

Fluorine is the most electronegative element and also the most reactive non-metal.

Flourine is the most electro negative among them.

Because in the outermost shell, there are 7 elections.

So to become stable it required only 1 election.
So it gains 1 electron from any atoms who has extra 1 electron.

Though flourine required 1 electron, it becomes F". Or ELECTRO NEGATIVE.

As fluorine's atomic number is 9, it possesses 7 valency electrons of valency shell 2s^2. 2p^5 so only one more electron is needed to get stability according to octet rule. So, fluorine is the most electronegative element,and the second most electronegative element is oxygen.

F because, electronegativity increase across the period and decrease down the group. But F and O are of the same period with atomic numbers 8 and 9 respectively and since F has a higher atomic no than O, hence F is highly electronegative than the other elements.

Oxygen is smaller in size as compare to fluorine but oxygen has 2 electrons in its balance shell which is difficult to gain and fluorine has only one electron it can gain it easily need less energy as compared to oxygen. Thus fluorine is more electronegative.

@Supriya.

I think you don't know about the trends in the periodic table atomic size decreases as you go from left to right and as the number of protons increase of electrons increases attraction increases therefore oxygen is bigger than fluorine.