When a radioactive substance emits an α α -particle, its position in the periodic table is lowered by
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B
When an 
-particle is emitted from the nucleus of a radioactive atom, the atomic number is reduced by 2 and mass number is reduced by 4. 
particle 
Elements are placed in the periodic table according to their atomic number. The emission of an 
- particle from the atom of an element reduces its atomic number by 2, so the element is converted into a new element which occurs 2 steps earlier in the periodic table.
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