What is igneous rock that forms beneath Earth’s surface as a result of the cooling of magma? A.
Intrusion
B.
Index Fossil

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.

→

indium, and thallium have three electrons i think

може ли да зареждате повече информация, моля