Quais são os fenômenos físicos ?

Which of these best describes an ionic bond?

In which of these cases are the two wave points considered to be in phase with each other?

Why does earth rotate? because earth is formed from cold gases collapsing due to gravity because the matter in the nebula that formed earth was spinning because earth forms more than 99% of the mass of the solar system because the hydrogen atoms inside the nebula fused to form helium