13.Which shows the order of increasing ionization energy? a. Si, Al, Mg, Na
b. Ga, Ge, As, Se
c. Be, Mg, Ca, Sr
d. F, Cl, Br, I

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.

→

they are all solids.