Understanding Isotopes and Atomic Weight

What makes an element unique in terms of its atomic structure?

• The number of neutrons

• The number of protons

• The number of electrons

• The atomic mass

What is the term for atoms of the same element with different mass numbers?

• Ions

• Isotopes

• Compounds

• Molecules

How is the percent abundance of an isotope calculated?

• By dividing the atomic weight by the mass number

• By multiplying the atomic number by the mass number

• By dividing the number of atoms of the isotope by the total number of atoms of all isotopes and multiplying by 100

• By dividing the number of protons by the total number of atoms

What is the atomic weight of an element?

• The mass of the most abundant isotope

• The average mass of all isotopes of the element

• The number of protons in the nucleus

• The sum of protons and neutrons

How do you calculate the atomic weight of an element?

• By adding the masses of all isotopes

• By multiplying the mass number by the percent abundance

• By calculating the weighted average of the masses of all isotopes

• By averaging the atomic numbers of all isotopes