percent abundance

What is the first step in calculating the atomic mass of an element?

• Multiply the mass of each isotope by its natural abundance

• Add the masses of all isotopes

• Divide the total mass by the number of isotopes

• Subtract the smallest mass from the largest mass

What does the resulting sum represent in the atomic mass calculation?

• The weighted average mass of the atoms of the element

• The total number of isotopes

• The heaviest isotope's mass

• The lightest isotope's mass

How is natural abundance expressed in atomic mass calculations?

• As a decimal

• As a percentage

• As a fraction

• As a whole number

What is the purpose of multiplying the mass of each isotope by its natural abundance?

• To find the weighted contribution of each isotope to the atomic mass

• To determine the heaviest isotope

• To calculate the total number of isotopes

• To identify the most common isotope

In the context of atomic mass calculations, what is meant by 'weighted average'?

• The average mass considering the natural abundance of each isotope

• The average mass of the heaviest isotopes only

• The average mass of the lightest isotopes only

• The simple average of all isotopes' masses

What is the percent abundance of magnesium-24?

• 79%

• 10%

• 11%

• 24%

Tags

NGSS.HS-PS1-8

Which isotope has the highest mass contribution?

• magnesium-24

• magnesium-25

• magnesium-26

• magnesium-23

What is the total percent abundance of all isotopes?

• 100%

• 79%

• 90%

• 110%

How is the atomic mass calculated from isotopes?

• By adding all mass contributions

• By averaging the masses

• By multiplying percent abundance with mass

• By taking the mass of the most abundant isotope

Which isotope has the least percent abundance?

• magnesium-25

• magnesium-24

• magnesium-26

• magnesium-23