LC Chemistry Radioactivity

The half-life of Iodine-131 is 8 days. What does this mean?

• The lifespan of Iodine-131 is 8 days

• Iodine-131 takes 8 days to become a radioactive material

• Iodine-131 takes 8 days to decay to half the amount of its original amount

• Iodine-131 takes days to become a non-radioactive material

"A random and spontaneous process where an unstable nucleus emits radioactive radiation until the nucleus becomes more stable.."

The statement above refer to...

• Half -life

• Nuclei decay

• Radioactivity

• Radioactive decay

All examples below were radioactive substance, except for....

• Uranium-235

• Radon-222

• Thorium-234

• Carbon-16

Alpha particles.....

• are positively charged.

• consist of two protons and four neutrons.

• can penetrate any thickness of matter

• All of the above

When a nucleus undergoes gamma decay, the atomic number of the element....

• remains the same

• decreases by one.

• increases by one.

• increases by two.

The type of radioactive particle that can be stopped by a sheet of paper is the ____.

• alpha particle

• beta particle

• gamma ray

Negatively charged particles emitted from a nucleus at a high speed are ____.

• alpha particle

• gamma rays

• beta particles

Two atoms of the same element but with different mass numbers are called________

• electrons

• isotopes

• ions

In order of most to least penetrating radiation we have

• Alpha , Beta, Gamma

• Beta , Gamma , Alpha

• Gamma, Beta, Alpha

• Gamma, Alpha, Beta

Which type of nuclear radiation is being emitted here?

• alpha

• beta

• gamma