no. they are more stable when they have completely filled or half filled shells
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No, atoms are most stable when their outermost electron shells are completely filled. This is because a full outer shell results in a lower energy state, making the atom more stable. Partially filled shells can lead to greater reactivity as atoms seek to fill or empty their outermost shell.
Atoms which form covalent bonds do share electrons. An example would be the atoms in a water molecule. Yes, the electrons are really shared.
It is very stable #APEX :P
No, not all atoms decay over time. Some atoms are stable and do not undergo radioactive decay.
Xenon is considered to be weakly reactive because it has a completely filled outer electron shell, making it stable and less likely to form chemical bonds with other elements. Additionally, the large size of xenon atoms and their poor overlap with other atoms' orbitals further diminishes its reactivity.
Unstable atoms can gain stability by undergoing radioactive decay, where they emit particles or energy to transform into a more stable configuration. They can also achieve stability by capturing or releasing neutrons or undergoing nuclear reactions to form a more stable nucleus.