Here's why:

* Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond.

* Sulfur has a higher electronegativity than hydrogen because it has more protons in its nucleus, which creates a stronger attraction for electrons.

* Sulfur's electronegativity value is 2.58 on the Pauling scale, while hydrogen's is 2.20.

Therefore, in a bond between sulfur and hydrogen (like in H₂S), the sulfur atom will have a slightly negative charge, while the hydrogen atoms will have a slightly positive charge.