Why is air referred to as a mixture of gases

Explanation:

air is considered as a mixture of gases because it contains many gases. They are :

78 % Nitrogen

21 % oxygen

And 1 % other gases

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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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