Define electronegatively.

Answer

**Step-by-Step Solution:**

1. **Definition of Electronegativity:**
Electronegativity is defined as the tendency of an atom to attract a shared pair of electrons when it forms a chemical bond.

2. **Understanding Shared Pair of Electrons:**
In a covalent bond, two atoms share a pair of electrons. These shared electrons are what electronegativity refers to.

3. **Example of Electronegativity:**
Consider the molecule hydrogen fluoride (HF). In this molecule, there is a covalent bond between hydrogen and fluorine.

4. **Comparison of Electronegativity:**
Fluorine is more electronegative than hydrogen, meaning it has a greater tendency to attract the shared pair of electrons in the bond.

5. **Result of Electronegativity:**
As a result of this difference in electronegativity, the shared electrons are pulled closer to the fluorine atom, giving it a partial negative charge, while the hydrogen atom acquires a partial positive charge.

6. **Electronegativity Value:**
The electronegativity of fluorine is approximately 3.98 on the Pauling scale, which indicates its strong ability to attract electrons.