Understanding Isotopes and the Periodic Table

What does the atomic number of an element represent?

• The number of neutrons in an atom

• The number of protons in an atom

• The number of electrons in an atom

• The total mass of the atom

How is the periodic table organized according to Henry Mosley?

• By element symbol

• By electron configuration

• By atomic number

• By atomic mass

What information does the mass number of an atom provide?

• The number of neutrons and electrons

• The number of protons and neutrons

• The total number of electrons

• The number of protons and electrons

How can you determine the number of neutrons in an atom?

• Divide the mass number by the atomic number

• Subtract the atomic number from the mass number

• Multiply the atomic number by the mass number

• Add the atomic number to the mass number

What defines isotopes of the same element?

• Different numbers of protons

• Different numbers of electrons

• Different numbers of neutrons

• Different atomic numbers

Which form of notation includes the element's name and mass number?

• Hyphen form

• Nuclear form

• Atomic form

• Symbolic form

What does the average atomic mass of an element indicate?

• The mass of the lightest isotope

• A weighted average of all isotopes

• The mass of the heaviest isotope

• The mass of the most stable isotope

In nuclear notation, where is the mass number placed?

• Bottom right corner

• Top left corner

• Bottom left corner

• Top right corner

What is the most common isotope of carbon based on its average atomic mass?

• Carbon-11

• Carbon-12

• Carbon-13

• Carbon-14

Why is the average atomic mass of an element a decimal number?

• It is an average of the masses of all isotopes

• It represents the mass of a single isotope

• It is the mass of the most abundant isotope

• It is the mass of the least abundant isotope