Understanding Atomic Number, Mass Number, and Atomic Mass

What does the atomic number of an element represent?

• The average mass of all isotopes

• The number of electrons in an atom

• The number of protons in an atom

• The total number of protons and neutrons

Where can you typically find the atomic number of an element?

• In a chemical reaction

• On the periodic table

• On a laboratory equipment

• In a chemistry textbook

What is the mass number of an atom?

• The number of protons only

• The average mass of isotopes

• The number of neutrons only

• The sum of protons and neutrons

Why is the mass number not found on the periodic table?

• It is a theoretical concept

• It varies for different isotopes of the same element

• It is not important for chemical reactions

• It is the same for all elements

How are electrons compared to protons and neutrons in terms of mass?

• Electrons are heavier than protons and neutrons

• Electrons have the same mass as protons and neutrons

• Electrons are not part of an atom's mass

• Electrons are much lighter than protons and neutrons

What is an isotope?

• An atom with a different number of electrons

• An atom with a different atomic number

• An atom with a different number of protons

• An atom with a different number of neutrons

How is atomic mass calculated?

• By measuring the atom's volume

• By counting the number of electrons

• By averaging the masses of all isotopes

• By adding the number of protons and neutrons

What does the atomic mass on the periodic table represent?

• The average mass of all isotopes of an element

• The number of neutrons in an atom

• The mass of a single atom

• The number of protons in an atom

How does the mass number differ from atomic mass?

• Mass number includes electrons, atomic mass does not

• Mass number is found on the periodic table, atomic mass is not

• Mass number is specific to one atom, atomic mass is an average

• Mass number is an average, atomic mass is specific

In the family height analogy, what does the mass number represent?

• The average height of the family

• The height of the tallest family member

• The height of an individual family member

• The height of the shortest family member