Question

The radio active decay of uranium into thorium is expressed by the 92^U238 `->` 90^Th234 + x where x is

Options

• An electron

• A proton

• A deutron

• An alpha particl~

Answer 1

An electron

Explanation:

Mass no of X = 238 – 34

Z + 2 = 92, Z = 92 – 90 = 2

∴ X = 2He4 i.e `alpha` particle.