Sarah is conducting an experiment on the Law of Conservation of Mass and physical and chemical changes using food. She learned in class that cooking food causes both physical and chemical
changes. She decides that she will cook a banana pudding. She uses the following ingredients for her
experiment: 1. three Bananas 2. one (12-02.) box vanilla wafer cookies 3. two cups of whole milk 4.
four large eggs; and, 5. one cup of sugar. The total weight for all of the ingrediants is 3 pounds 10
ounces before mixing her ingredients. Sarah prepares her banana pudding and bakes it in the oven
until it is brown on top. She then weighs her banana pudding and it weighs 3 pounds 10 ounces. Why
does her banana pudding weigh the same? Why does her banana pudding not look the same? Explain
the physical and chemical changes that occurred as she baked her pudding.
Your answer

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.

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.