Which of the following occur during all nuclear reactions? check all that are true

a. an atom splits into smaller atoms.

b. an atom becomes a new element.

c. an atom’s nucleus is affected.

d. some mass is turned into energy.

True answers would be B, C, and D.

A:  This statement is not true. The "splitting" that is seen in nuclear reactions is shown in the nucleus of an atom, not the atom itself splitting.

B: This statement is true, see the equation I created below, which illustrates the creation of oxygen atoms.

4He^2+14N^7→17O^8+1H^1

C: This statement is true. In nuclear fission, one form of a nuclear reaction, an atom's nucleus is split into smaller parts, which quite obviously affects the nucleus, seeing as it is now in several parts.

D: This statement is true. We know this because of the well known equation created by Einstein, E = mc2. In a nuclear reaction, mass is not strictly conserved.  Some of the mass is converted into energy.

I hope this was helpful! Let me know if you need any further explanation. I tried my best to thoroughly explain this, as I have background in this sort of education.

emerging idea only occurs as a raw idea that could appear out of nowhere. meanwhile, to reach scientific consensus , that idea must be structured and tested over and over again through various experiments. the scientific consensus transforms the raw idea into idea that is more reliable through the process of scientific elimination.