Question

arrange fluorine, carbon, oxygen, Nitrogen in the decreasing order of electronegativity​

Answer 1

Answer:

F > O > N > C

As we move from left to right of periodic table across a period electronegativity increases due to increase in no. of electrons in the valency shell.

hope this will help you

Answer 2

Answer:

Hint: To answer this question the periodic properties of the elements from different groups should be known. The periodic properties have opposite trends between left to right and top to bottom. Halogens fluorine and chlorine are from group 17. Which is on the right side of the periodic table. And nitrogen and oxygen from groups 15 and 16 respectively.

Complete step by step answer:

Halogens are the most electronegative atoms of each period of the periodic table. Top to bottom of the halogen group size increases because of the number of electrons as well as the number of shells increases. Now with increasing the number of shells their atomic mass is also increased and electronegativity decreases.

In the case of the periodic table from left to right metallic character decreases and non-metallic character increases as well as the electropositivity of the element decreases and electronegativity increases.

Considering these trends Fluorine is the highest electronegative atom in the periodic table. But from top to bottom electronegativity decreases. Therefore, the electronegativity of chlorine is less than fluorine.

In the case of nitrogen and oxygen depending on their position in the periodic table electronegativity is greater than oxygen.

Note their electronegativity value is, F=4,Cl=3,N=3,O=3.5

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Therefore, due to the opposite trend of electronegativity, the electronegativity of nitrogen and chlorine become the same, so the correct order of their electronegativity is, F>0>N≈Cl

So, the correct answer is D.

Note:

Due to the high atomic mass of the bottom elements of this group, the physical state of the bottom elements is solid at room temperature. And due to low molecular mass top elements are in a gaseous state at room temperature. But bromine is in the middle of the group and also the molecular mass of from is not large to be solid as well as low to be gas. Due to this reason, the physical state of bromine is liquid at room temperature.