Question

What is radioactive matter?

Answer 1

radioactive matter is an object which produces radioactive waves of it own for example the waves which the Rutherford carried its experiment was radioactive wave and it was done by Radioactive matter.

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Answer 2

The radioactive elements are percent in the 18th group of the periodic table. It is said to be radioactive because of its octet nature, the valences of the outter  most shell is filled fully the radioactive elements are

He

Ne

Ar

Kr

Xe

Rd

Og