Near the beginning of earth’s history, it melted due to collision with extraterrestrial bodies, such as meteors. This caused all of the elements on the planet to arrange themselves according to density. Where would we expect to find the most dense of Earth’s elements? A) The core
B) The crust
C) The mantle
D) The atmosphere
And why

it is to be noted that an alpha particle is an helium nucleus. so it contains 2 protons 2 neutrons and has a mass number of 4. when alpha decay particles are ejected from the nucleus it gets transformed into an atom which has atomic number less than 2 and a mass number less than 4.

an equation that could represent alpha decay is radium 226 decay of alpha particle forms radon 222.

→

gas

explanation:

smoke is the matter of a gas