Which of the following has the correct chemical formula based of the given
chemical name?

Beryllium selenide

Explanation:

First one should be Al2S3

while second one should be MgF2

and last is wrong as well as it should be 2 sodiums and 1 oxygen so Na2O

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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1. they vary with a higher number because boiling is way hotter than melting