Known forces of nature can be divided into 4 classes i e gravity electromagnetism weak nuclear force...........

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Known forces of nature can be divided into 4 classes i.e., gravity, electromagnetism, weak nuclear force and strong nuclear force. With reference to them which of the following statement is not correct?

gravity is strongest of the four

weak nuclear forces causes radioactivity

electromagnetism acts only on particles with an electric charge

strong nuclear forces holds protons and neutrons inside nucleus of an atom

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Explanation:

Gravitational Force – Weakest force; but infinite range. ( Not part of standard model)
•    Weak Nuclear Force – Next weakest; but short range.
•    Electromagnetic Force – Stronger, with infinite range.
•    Strong Nuclear Force – Strongest; but short range.