Why did scientists expect that the nucleus contained more than just protons? Nuc

Question

Why did scientists expect that the nucleus contained more than just protons?

Nuclei have less mass than could be accounted for by the amount of their positive charge.

Nuclei have about half as many mass units as can be explained by the amount of their positive charge.

Nuclei have approximately twice as many mass units as can be explained by the amount of their positive charge.

There were symmetry arguments about protons.

Without the negative charge of the neutron, electric repulsion between the positively charged protons would tear the nucleus apart.

Explanation / Answer

Correct answer is:

Nuclei have approximately twice as many mass units as can be explained by the amount of their positive charge.

Since, mass number = no of protons + no of neutrons

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