Group 2 on the periodic table contains Be(Beryllium), Mg(Magnesium), Ca(Calcium), Sr(Strontium), B(Barium), and Ra(Radium). All are Alkaline earth metals.
Answer: Heat causes surrounding air to rapidly expand and vibrate, which creates the pealing thunder we hear a short time after seeing a lightning flash.
Alpha particle form of decay produces a nucleus similar to the element helium. During Alpha decay an atom spits out two protons and two neutrons from its nucleus.
