Definition: This is a method of deducing the correct species assignment of a living thing. As the alternative name implies, it works by offering two (or sometimes more) alternatives at each juncture, and
the choice of one of those alternatives determines the next step.
Example: You can use one of these to unlock the identity of an organism.
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Term:

Dichotomous Key

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.

→

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).