Two conducting balls, suspended by threads, are attracted to each other. Can one of the balls be charged

Two conducting balls, suspended by threads, are attracted to each other. Can one of the balls be charged and the other not? Can both balls be charged? If yes, then with the same name or with the opposite?

If one of the balls is charged and the other is uncharged, then they will be attracted, and this happens for the following reason. Suppose the 1st ball is negatively charged – there is an excess of electrons, they are distributed evenly over the surface, with its charge ball 1 repels the electrons of ball 2, positive ions form an excess of charge “+” on the nearest area of the surface 2 of the ball, the balls are thus attracted. If ball number 1 is positively charged, then everything is the same.

They can. Differently.