If two objects repel each other they must contain like charges.
According to the first law of electrostatics, like charges repel and unlike charges attract. An atom is neutral if it is made up of equal number of positive and negative charges.
If an atom has more positive than negative charges then it is positively charged. If the atom has more negative than positive charges, then it is negatively charged.
if two objects repel from one another, they must contain like charges.
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