Question

the most electronegative element among the following is

A. sodium
B. bromine
C. fluorine
D. oxygen

Answer 1

fluorine is most elecro-ve element

Answer 2

option C . fluorine

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.