Potassium Isotopes and Properties

The video tutorial explains how to determine the number of protons, neutrons, and electrons in potassium isotopes. It covers the atomic number, which is 19 for potassium, and how this relates to the number of protons and electrons in a neutral atom. The video also discusses the differences in neutron numbers among isotopes, leading to different mass numbers. It highlights the three main isotopes of potassium: potassium-39, potassium-40, and potassium-41, and their relative abundances. Finally, the video introduces nuclear notation to represent isotopes.

What is the atomic number of potassium?

• 18

• 20

• 21

• 19

In a neutral potassium atom, how do the number of protons compare to the number of electrons?

• Cannot be determined

• Protons are more

• Electrons are more

• They are equal

What determines the mass number of an isotope?

• Atomic number

• Sum of protons and neutrons

• Number of electrons

• Number of protons

How many neutrons are present in the most common isotope of potassium?

• 21

• 20

• 19

• 18

What is the mass number of potassium-40?

• 39

• 40

• 41

• 42

Which isotope of potassium is most abundant?

• Potassium-42

• Potassium-39

• Potassium-40

• Potassium-41

What is the approximate percentage of potassium-39 in nature?

• 100%

• 50%

• 93%

• 6-7%

What is the nuclear notation for potassium-39?

• 39K19

• 39K20

• 40K19

• 41K19

Which of the following isotopes of potassium has the highest number of neutrons?

• Potassium-39

• Potassium-41

• Potassium-40

• Potassium-42

What does the nuclear notation represent?

• Chemical symbol

• Atomic number

• Average atomic mass

• Specific isotope