?How many protons are in a radium-226 nuclide

How many protons are in a radium-226 nuclide?
A. 88
B. 138
C. 226
D. 314

How many types of quarks are there?
A. 2
B. 4
C. 6
D. 8

What would happen if bismuth-208 lost 1 proton and gained 1 neutron?
A. It would become lead-207.
B. It would become lead-208.
C. It would become bismuth-207.
D. It would stay bismuth-208

.Why are strong forces able to hold atomic nuclei together?
A. Strong forces act only between protons at long distances.
B. Strong forces increase the mass of neutrons.
C. Strong forces overcome electrostatic repulsion among protons.
D. Strong forces act at short distances between electrons and protons.


How many neutrons are in a nucleus of uranium-238?
A. 92
B. 146
C. 184
D. 238


Why are large amounts of energy required to separate a nucleus into protons and neutrons even though the protons experience electrostatic repulsion?
A. The forces holding the nucleus together are much stronger than the repulsion among the protons.
B. The electrostatic forces acting among other atoms lower the force of repulsion of the protons.
C. The interactions between neutrons and electrons neutralize the repulsive forces among the protons.
D. The force of the protons repelling each other is small compared to the attraction of the neutrons to each other.

1)a
2)c
3)b
4)c
5)b
6)idk im guessing a