Molecules
large intermolecular spaces
low melting and boiling points
gases, volatile liquids, or soft solids
the characteristics listed above describe a) ionic crystals. b) metallic salts. c) covalent compounds. d) compounds containing halogens.

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.

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