Final answer:
The order of elements by increasing electronegativity, from least to greatest, is Lithium (Li), Boron (B), Oxygen (O), and Fluorine (F).
Step-by-step explanation:
The question asks to rank the given elements by increasing electronegativity: Boron (B), Oxygen (O), Fluorine (F), and Lithium (Li). Based on the periodic trends, electronegativity increases from left to right across a period and decreases down a group. Therefore, the correct order from least to most electronegative is:
- Lithium (Li)
- Boron (B)
- Oxygen (O)
- Fluorine (F)
As such, lithium has the lowest electronegativity, and fluorine, being the most electronegative element, has the highest value. This order can be confirmed by looking at their positions on the periodic table and the Pauling electronegativity values.