Exploring Atomic Structure and Isotopes

Who discovered the neutron and in which decade?

• Niels Bohr in the 1950s

• Robert Millikan in the 1940s

• James Chadwick in the 1930s

• Ernest Rutherford in the 1920s

What is the relative mass of an electron?

• 0.5 atomic mass units

• 2 atomic mass units

• 0 atomic mass units

• 1 atomic mass unit

How do you calculate the number of neutrons in an atom?

• Multiply the atomic number by the atomic mass

• Divide the atomic mass by the atomic number

• Subtract the atomic number from the atomic mass

• Add the atomic number to the atomic mass

What does the prefix 'iso' in isotope mean?

• Similar

• Equal

• Opposite

• Different

Tags

NGSS.HS-PS1-8

Which isotope of carbon is most abundant in nature?

• Carbon-14

• Carbon-15

• Carbon-13

• Carbon-12

What does a mass spectrometer measure?

• Atomic number

• Relative atomic mass

• Mass-to-charge ratio

• Number of neutrons

What is the relationship between mass and deflection in a mass spectrometer?

• More massive particles experience less deflection

• Less massive particles experience less deflection

• Mass does not affect deflection

• More massive particles experience more deflection

What is relative abundance?

• The percentage of a particular isotope in nature

• The number of protons in an isotope

• The total number of isotopes in nature

• The average mass of all isotopes

How do you calculate the weighted average atomic mass?

• Add the masses of all isotopes

• Multiply the mass of each isotope by its relative abundance and sum the results

• Subtract the atomic number from the atomic mass

• Divide the total mass by the number of isotopes

If boron has two naturally occurring isotopes, how can you express their abundances?

• As X and Y

• As X and 1-X

• As X and X-1

• As X and 2X