An attraction between two atoms

Answer 1

Electrostatic forces between the positively charged nucleus and the electron.

In a covalent bond if there is a difference of electronegativity between the atoms then the shared electrons are "attracted" to the most electronegative element.

Answer 2

they were both Spanish Surrealist artists of the 20th Century. The sharing of each other's electrons. Atoms combine when they do not have enough electrons, or have too many electrons, to remain stable on their own, but can attain stability by sharing the electrons of (or with) another atom. The end result is a body called a MOLECULE.

Answer 3

2 atoms become attracted by their own proton and the proton of the other atom. Once this attraction occurs, they will spend more time together than separate.