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Question: When a radioactive substance emits an α-particle, its position in the periodic table is lowered by....

When a radioactive substance emits an α-particle, its position in the periodic table is lowered by.

A

One place

B

Two places

C

Three places

D

Four places

Answer

Two places

Explanation

Solution

ZXA→αZ−2XA−4ZX^{A}{\overset{\quad\alpha\quad}{\rightarrow}}_{Z - 2}X^{A - 4}