Calcium chloride contains only calcium and chloride. what is the formula for this compound? (you will need the periodic table for this question to determine the groups of these elements and, thus, determine their ionization. you might also choose to access the video for the periodic table of the elements in the introduction to this question.) express your answer as a chemical formula.

Explanation:

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Calcium is alkaline-earth metal located at the group IIA, which means that gains two electrons when bonded with another element, thus, its oxidation state is +2. However, the halogen (group VIIA element) chlorine in the form of chloride ions loses one electron, hence is oxidation state is -1. In such a way, when they gather in one compound, the resulting formula turn out into:

Which accounts for calcium chloride.

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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.