Arrange the following elements in increasing order of electronegativity: $\text{N, O, F, C, Si}$.

Electronegativity increases across a period (left to right) and decreases down a group.Silicon ($\text{Si}$) is below Carbon in Group 14, so it is less electronegative than Carbon.For period 2 elements: $\text{C}<\text{N}<\text{O}<\text{F}$.Combining these: $\text{Si}<\text{C}<\text{N}<\text{O}<\text{F}$.(Values: $\text{Si}\approx 1.8$, $\text{C}\approx 2.5$, $\text{N}\approx 3.0$, $\text{O}\approx 3.5$, $\text{F}\approx 4.0$).