Radioactive Isotopes

What does the Z represent in this depiction of an isotope notation?

• the mass number of the isotope

• the symbol of the element

• the atomic number of the isotope

• the number of protons and neutrons in the isotope

Which nuclear decay emission consists of energy only?

• alpha decay

• 1. beta decay

• 1. gamma ray (radiation)

• 1. positron emission

Tags

NGSS.HS-PS1-8

NGSS.HS-PS4-3

What type of radioactive decay is depicted in this diagram?

• neutron emission

• gamma decay

• beta decay

• alpha decay

Tags

NGSS.HS-PS1-8

Which of the following correctly describes a beta particle?

• the same atomic number and mass number as a helium nucleus

• formed from a neutron that breaks into a proton and an electron

• is the equivalent of one proton

• can be stopped by a piece of paper

Tags

NGSS.HS-PS1-8

Which of the following is NOT a characteristic of an beta particle?

• • the ejected particles can pass through paper, but not aluminum or wood

• a neutron breaks apart into a proton and an electron

• When emitted, changes the atomic number of the daughter isotope by 2

• When emitted, does not change the mass number of the daughter isotope

Tags

NGSS.HS-PS1-8

Which list of nuclear emissions is arranged in order from the least penetrating power to the greatest penetrating power?

• alpha particle, beta particle, gamma ray

• alpha particle, gamma ray, beta particle

• gamma ray, beta particle, alpha particle

• beta particle, alpha particle, gamma ray.

The % of the parent isotope remaining after 3 Half Lives.

• 50%

• 25%

• 12.5%

• 6.25%

Tags

NGSS.HS-PS1-8

A sample will lose half of the parent isotope after 1 half life.

• TRUE

• FALSE

Tags

NGSS.HS-PS1-8

The diagram shows 32 atoms.

16 of the Red are parent isotopes

16 of the Green are daughter isotopes

How many half-lives have occurred?

• 0

• 1

• 2

• 3

Tags

NGSS.HS-PS1-8

The diagram shows 32 atoms

8 of the Red are parent isotopes

24 of the Green are daughter isotopes

How many half-lives have occurred?

• 0

• 1

• 2

• 3

Tags

NGSS.HS-PS1-8