How many neutrons would an astatine atom have after emitting an alpha particle

Match the mixture with the substance// i really need on this guys (it’s a pic btw)

Why are people not able to skip a dive to the deepest part of the ocean

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