What the answer number the letter a, b,c with the answer bottom

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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your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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