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When radioactive substance emits an alph...

When radioactive substance emits an `alpha-`particle, then its position in the periodic table is lowered by.

A

One place

B

Two places

C

Three places

D

Four places

Text Solution

Verified by Experts

The correct Answer is:
B
Alpha-particle `= ""_(2)He^(4)`
Number of protons decreases by 2 in the product. Position is determined by no. of protons.
`therefore` Position in the periodic table is lowered by two places.
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