These statements describe three different reactions.

1 - an atom shares electrons with another atom.
2 - the nucleus of an atom is split apart.
3 - an atom gains an electron from another atom.

which reaction(s) most likely release the greatest amount of energy?
1
2
1 and 3
2 and 3

Option (b) is the correct answer.

Explanation:

When an atom shares electrons with another atom then it results in the formation of covalent bond.

Whereas when an atom transfer electrons from one atom to another then it results in the formation of ionic bond.

When nucleus of an atom splits then it represents nuclear fission reaction and energy is released during this process.

For example,

Therefore, we can conclude that out of the given options, the nucleus of an atom is split apart most likely release the greatest amount of energy.

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.