6.7 SA Physical science

What is the characteristic of an isotope that does not change, and "defines" an element?

• mass number

• electron number

• neutron number

• proton number

Br-80 has 35 protons. How many neutrons are in the atom?

• 35

• 45

• 80

• 10

Tritium and Deuterium are two isotopes of Hydrogen, that only vary in the

• number of protons

• number of electrons

• number of neutrons

• atomic number

In the radon decay equation depicted above, the form of ionizing energy released is ​ (a)   This form of ionizing energy can be stopped by ​ (b)  

• Aluminum

• Beta

• alpha
• paper
• lead
• gamma

Since Actinium-225 has a half-life of 10 days, if we start with 100g, after 1 month (30 days), we will have only ​ (a)   grams left. At this rate of decay, it would take ​ (b)   days until less than 1g of the original 100g of Ac-225 remained.

• 12.5
• 70
• 100
• 0
• 50
• 30

Merging atoms together to release energy is called ​ (a)   . The end product has a​ (b)   mass. Currently, this form of nuclear energy can only be done sustainably in the ​ (c)   .

• heavier

• lighter

• fusion
• heavier
• sun and stars
• fission
• leaves and plants
• ocean
• equal
• combustion

Which of the following statements regarding the actinide series is NOT correct?

• Unstable elements.

• Used in fission chain reactions.

• Most famous of the series is Uranium (U-235).

• Found at the top right of the periodic table of elements.

Which of the following is NOT a current use of fission/radioactive decay?

• Making energy in submarines.

• Making energy in community nuclear power plants.

• Making energy in spacecraft.

• Making energy in cars.

In fission, a neutron is used to provoke an unstable atom into splitting causing a____________ This process releases more neutrons which then interact with more unstable atoms. The process will continue as long as unstable atoms are present.

• chain reaction.

• series of unfortunate events.

• cold fusion reaction.

• combustion reaction.

These long-tube structures are filled with neutron absorbing material used to decrease fission reactions in a nuclear reactor.

• control rods

• fuel rods

• spent fuel rods

• recycled fuel rods