The radioactive nature of a material like Cobalt-60 is determined by the instability of its atomic nucleus. Here are the steps that explain this:

1. Atomic Structure: Every atom is composed of a nucleus (containing protons and neutrons) and electrons that orbit the nucleus. The number of protons determines the atomic number and the type of element. The sum of protons and neutrons gives the atomic mass.

2. Isotopes: Atoms of the same element can have different numbers of neutrons, resulting in different atomic masses. These different versions of the same element are called isotopes.

3. Radioactive Isotopes: Some isotopes have an unstable nucleus that can spontaneously emit particles and energy. This process is called radioactive decay. The isotopes that undergo this process are called radioactive isotopes or radioisotopes.

4. Cobalt-60: Cobalt-60 is a specific isotope of cobalt. It has 27 protons (which makes it cobalt) and 33 neutrons (which makes it the isotope Cobalt-60). This particular combination results in an unstable nucleus.

5. Radioactive Decay: The nucleus of Cobalt-60 is unstable and undergoes radioactive decay. It emits two high-energy gamma rays and changes into a stable isotope of nickel (Nickel-60). This emission of radiation is what makes Cobalt-60 radioactive.

6. Half-Life: The rate at which a radioactive isotope decays is characterized by its half-life, which is the time it takes for half of the atoms in a sample to decay. Cobalt-60 has a half-life of about 5.27 years.

In conclusion, the radioactive nature of a material is determined by the instability of its atomic nucleus, which leads to radioactive decay. The specific combination of protons and neutrons in Cobalt-60 results in an unstable nucleus that emits radiation, making it a radioactive material.

Question

The radioactive nature of a material like Cobalt-60 is determined by the instability of its atomic nucleus. Here are the steps that explain this:

1. Atomic Structure: Every atom is composed of a nucleus (containing protons and neutrons) and electrons that orbit the nucleus. The number of protons determines the atomic number and the type of element. The sum of protons and neutrons gives the atomic mass.

2. Isotopes: Atoms of the same element can have different numbers of neutrons, resulting in different atomic masses. These different versions of the same element are called isotopes.

3. Radioactive Isotopes: Some isotopes have an unstable nucleus that can spontaneously emit particles and energy. This process is called radioactive decay. The isotopes that undergo this process are called radioactive isotopes or radioisotopes.

4. Cobalt-60: Cobalt-60 is a specific isotope of cobalt. It has 27 protons (which makes it cobalt) and 33 neutrons (which makes it the isotope Cobalt-60). This particular combination results in an unstable nucleus.

5. Radioactive Decay: The nucleus of Cobalt-60 is unstable and undergoes radioactive decay. It emits two high-energy gamma rays and changes into a stable isotope of nickel (Nickel-60). This emission of radiation is what makes Cobalt-60 radioactive.

6. Half-Life: The rate at which a radioactive isotope decays is characterized by its half-life, which is the time it takes for half of the atoms in a sample to decay. Cobalt-60 has a half-life of about 5.27 years.

In conclusion, the radioactive nature of a material is determined by the instability of its atomic nucleus, which leads to radioactive decay. The specific combination of protons and neutrons in Cobalt-60 results in an unstable nucleus that emits radiation, making it a radioactive material.

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