Group displacement law
:
:
When a radioactive element emits
a
.
a
An
α
−
α
particle, it is converted into an atom of a daughter element of atomic number two less and atomic mass four less than the parent element and the new element occupies a place two groups lower
(
i
.
e
.
,
(
to the left
)
)
in the periodic table.
b
.
b
A
β
−
β
particle, it is converted into ta new element of the same atomic mass, but with atomic number one greater than the parent element and the new element occupies a place one group higher
(
i
.
e
.
,
(
to the right
)
)
in the periodic table. The daughter table. The daughter element will belong to group
I
I
I
after
β
−
β
emmision.