# A produces B by α-emission. If B is in group 16 of the periodic table, what is the group of A? - Chemistry

Numerical

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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#### APPEARS IN

Balbharati Chemistry 11th Standard Maharashtra State Board
Chapter 13 Nuclear Chemistry and Radioactivity
Exercises | Q 3. (Q) | Page 203