Here's why:
* Electronegativity: Carbon (C) has a higher electronegativity than hydrogen (H). This means carbon attracts electrons more strongly than hydrogen.
* Polar Covalent Bonds: The C-H bonds in methane are considered polar covalent bonds. While the electrons are shared, they are not shared equally. The carbon atom pulls the shared electrons slightly closer to itself, creating a slightly negative charge on the carbon atom and a slightly positive charge on the hydrogen atoms.
However, it's important to note that methane is still considered a nonpolar molecule overall. This is because the four C-H bonds are arranged symmetrically around the carbon atom, causing the slight polarities to cancel each other out.
