A 45,000 milligram sample of element Y contains 6.02 x 10^23 atoms. What is the atomic mass of element Y?

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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we can conclude that the melting point of table salt is above room temperature (it's actually 801 deg c). the melting point of mercury must be below room temperature (- 39 deg c).

space exploration has led to the development and technological improvement of many everyday items. (if this answer is wrong i will find the right answer) : )

gold is my favorite solid.