7. A cook had a jar containing a sweet food and a jar containing a sour food. The image above shows
the sweet and sour foods. At room temperature, both foods are liquids. The same amount of energy
was transferred into both substances. Later, one of the foods had changed phase while the other had
not. Which food changed phase, and how did it change?

no but i do not usually comment or use my voice that much when it comes to social media

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.