The protons in a nucleus stay together due to the


1. The protons in a nucleus stay together due to the A) electromagnetic force B) strong nuclear force C) gravitational force

I need the answers for questions 1-7.

Answer

1. B strong nuclear force

2. A. 4hours

3. A same number of proton different number of neutrons  

4. D. 9

5. C

6. B

7. B  

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