Mention the basic tendency of an atom which makes it to combine with other atoms.

There are two possible ways in which an atom combines with another atom. It is either by sharing their valence (or outermost) electrons or by completely transferring electrons to form ions. The sharing or transfer of electrons creates some attraction force between elements that is called as chemical bond. An atom is reactive when it easily combines with other atoms.

Ch4 is nonpolar and insoluble in water. since all of the hydrogen atoms are evenly spread around the carbon atom even through the c h bond is polar all the poles cancel each other out.

Electrical charges of ionic bonds