I think the correct answer is C. Neutrons do not affect how atoms bond due to their neutral charge which makes it so that they don't affect the movement of electrons at all (chemical reactions occur when electrons are transferred/shared). Neutrons due however have a mass similar to that of a proton which means they contribute to the mass of the atom. Neutrons also effect the stability of the nucleas as shown in atoms that have radioactive isotopes. I hope this helps. Let me know if anything is unclear.
C. 4.5 kilometers. This answer will represent 9 divided by a half which will be 4.5
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to observe both solutions before the reaction
Answer:
The element is Lithium because it has atomic number of 3
ATOMIC NUMBER=NUMBER OF PROTONS
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