Because they're not confident enough to confirm it's indeed true but they will support it for they believe it's correct.
The three of them have the same amount of electrons, so we can’t determine the right one on that ground. As you might know, Pauli said that electrons are always in the position of the lowest energy. So the first situation is impossible because there is a free place available that takes less energy. Then the 3rd situation is nor possible because if one electron has a different spin than the others, there is a magnetic obstruction that be prevented if the spin changes. This means that the second situation is the right one.
Answer:True
Explanation:
Light year is the unit of distance and not a unit of time.
Light year is used to measure astronomical distances.
It is defined as the distance which light travels in one year.
The distance which light travels in one year is around 9.46 trillion kilometers
Thus 1 light year = 
km.
Thus the given statement that A light-year is the distance that light travels in one year is true.
This pull holds<span> the sodium atom near the chlorine atom, making a molecule of </span>salt<span> - one of the most stable molecules on Earth. Most of the solid things in the universe - like rocks - use </span>ionic<span> bonds to </span>hold<span> themselves </span>together<span>. That's because those same electric </span>forces<span> affect other nearby molecules of </span>salt<span> as well</span>
