3TSA Day10 EnTck10 Due Oct2

Why some isotopes are radioactive?

• Because some isotopes have big nuclei, releasing some particles will reach a stable state.

• Because some isotopes have small nuclei, releasing some particles will reach a stable state.

• Because some isotopes have no nuclei, releasing some particles will reach a stable state.

What is the process of radioactive decay?

• It is the process of a nucleus getting bigger.

• It is the process of a nucleus emitting radiation to become more stable.

• It is the process of a nucleus absorbing radiation to become more stable.

What is the main reason for an isotope to be radioactive?

• Because the isotope has an unstable nucleus.

• Because the isotope has a stable nucleus.

• Because the isotope has a large nucleus.

What makes an unstable nucleus in an isotope?

• Excess of protons compared to neutrons
• Excess of neutrons compared to protons
• Equal number of protons and neutrons
• Imbalance between the number of protons and neutrons compared to stable isotopes

Which carbon atoms are radioisotopes?

• Carbon-12
• Carbon-14
• Carbon-13
• Carbon-15

Which hydrogen atom is a radioisotope?

• A) Hydrogen-1

• B) Hydrogen-2

• C) Hydrogen-3

Which hydrogen atom is tritium?

• A) Hydrogen-1

• B) Hydrogen-2

• C) Hydrogen-3

Which hydrogen atom is deuterium?

• A) Hydrogen-1

• B) Hydrogen-2

• C) Hydrogen-3

The following image shows the use of radioisotopes in medicine. Which type of use is this radioisotope?

a

Radiotherapy

Medical tracer

Markers

The following image shows the use of radioisotopes in medicine. Which type of use is this radioisotope?

b

Radiotherapy

Markers

Medical tracer