Elements are arranged left to right, top to bottom, from smallest to largest, by .

increasing atomic number

Explanation: Elements are arranged left to right, top to bottom, from smallest to largest, of increasing atomic number.

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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