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Question
A produces B by α-emission. If B is in group 16 of the periodic table, what is the group of A?
Solution
\[\ce{^A_ZA ->[\alpha-Emissions] ^{A - 4}_{Z - 2}B + ^4_2He}\]
When α-emission occurs, atomic number decreases by 2 and the atomic mass number by 4.
Thus, if ‘B’ belongs to group 16 of the periodic table, that means the outermost orbit will contain 6 electrons.
Thus, ‘A’ will have 8 electrons in its valence shell and it will belong to group 18 of the periodic table.
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