Strontium Isotopes and Atomic Mass

This video tutorial explains the atomic structure of strontium, focusing on its atomic number, protons, neutrons, electrons, and mass number. It highlights the four naturally occurring isotopes of strontium, emphasizing the role of neutrons in differentiating them. The tutorial also covers the concept of neutrality in elements, where the number of protons equals the number of electrons. The video further explains how to calculate the mass number using the number of protons and neutrons, and discusses the most common isotope, strontium-88, and its abundance.

What is the atomic number of strontium?

• 38

• 36

• 39

• 37

How many protons does strontium have?

• 37

• 39

• 36

• 38

In a neutral atom of strontium, how many electrons are present?

• 36

• 39

• 38

• 37

What is the main difference between isotopes of the same element?

• Number of protons

• Number of electrons

• Number of neutrons

• Atomic number

How do you calculate the mass number of an isotope?

• Electrons + Neutrons

• Protons + Electrons

• Atomic number + Electrons

• Protons + Neutrons

What is the most common isotope of strontium?

• Strontium-86

• Strontium-87

• Strontium-88

• Strontium-89

What percentage of strontium atoms in a sample are typically strontium-88?

• 62%

• 72%

• 82%

• 92%

How is the average atomic mass of an element calculated?

• By adding all isotopes

• By averaging the mass numbers

• By weighting isotopes by abundance

• By counting protons and neutrons

If not given, how can you estimate the mass number of strontium?

• Use the atomic number

• Use the most common isotope

• Use the number of electrons

• Use the number of protons

What is the average atomic mass of strontium?

• 89.62

• 88.62

• 87.62

• 86.62