How do protons and neutrons stay together in a nucleus? A Electrostatic forces hold them together
B. Gravitational forces hold them together
C Weak nuclear forces hold them together
D. Strong nuclear forces hold them together

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D

Explanation:

The strong nuclear force pulls together protons and neutrons in the nucleus.

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metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

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