Differentiating Mass Number and Atomic Mass

What is another term for atomic mass?

• Atomic weight

• Mass number

• Proton number

• Neutron number

What does the mass number of an atom represent?

• The number of electrons

• The number of neutrons only

• The number of protons and neutrons

• The number of protons only

If an atom has 5 protons and 6 neutrons, what is its mass number?

• 11

• 10

• 6

• 5

Why do we not consider the mass of electrons when calculating the mass number?

• Electrons have a negligible mass

• Electrons are not present in atoms

• Electrons are not part of the nucleus

• Electrons have a significant mass

What determines the element of an atom?

• The number of protons

• The number of electrons

• The atomic mass

• The number of neutrons

What is an isotope?

• An atom with the same number of protons but different number of neutrons

• An atom with the same number of neutrons but different number of protons

• An atom with the same number of electrons but different number of protons

• An atom with the same number of protons and neutrons

What percentage of Boron atoms are Boron 11?

• 20%

• 50%

• 100%

• 80%

How do you calculate the average atomic mass of an element with isotopes?

• Divide the mass of each isotope by its abundance and add the results

• Add the masses of the isotopes and divide by the number of isotopes

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

• Add the masses of the isotopes and multiply by the number of isotopes

What is the average atomic mass of Boron if 20% of its atoms are Boron 10 and 80% are Boron 11?

• 10.0 amu

• 10.8 amu

• 10.5 amu

• 11.0 amu

What does atomic mass take into account that mass number does not?

• The number of electrons

• The abundance of isotopes

• The number of protons

• The number of neutrons