Which statement describes the differences between nuclear reactions and chemical reactions?

nuclear reactions involve changes to electrons, while chemical reactions involve changes to protons and neutrons.

only chemical reactions can be exothermic.

chemical reactions can result in new compounds, while nuclear reactions can result in new elements.
its "chemical reactions can result in new compounds, while nuclear reactions can result in new elements." : )

The atomic radius of sodium is 186 pm and of chlorine is 100 pm. the ionic radius for na+ is 102 pm and for cl– is 181 pm. in going from na to cl in period 3, why does the atomic radius decrease while the ionic radius increases? a. the inner electrons in the sodium cation shield its valence electrons more effectively than the inner electrons in the chloride anion do. b. the inner electrons shield the valence electrons more effectively in the chlorine atom than in the chloride anion. c. the outermost electrons in chloride experience a smaller effective nuclear charge than those in the sodium cation do. d. the outermost electrons in chloride experience a larger effective nuclear charge than those in the sodium cation do. e. monatomic ions are bigger than the atoms from which they are formed.

How much heat is added if 0.814g of water increase in temperature by 0.351 degree c?

Is this correct if not can u correct me