Radioactivity is the characteristic of which of the following?

Question

Question

This question was previously asked in

SSC Steno Previous Paper 6 (Held on: 13 Sep 2017 Shift 2)

Answer 1

CONCEPT:

Radioactivity: Radioactive decay is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is considered radioactive.
A radioactive nucleus consists of an unstable assembly of protons and neutrons which becomes more stable by emitting an alpha, a beta particle, or a gamma photon.
Atoms are radioactive if their nuclei are unstable and spontaneously (and random) emit various particles α, β, and/or γ radiations.

EXPLANATION:

The end result of radioactive decay is the creation of a stable atomic nucleus. So the radioactivity is the characteristics of the Nucleus. Hence option 1 is correct.