Question

1. the atomic mass on the periodic table represents: *

a) the lightest isotope
b) the heaviest isotope
c) the average of all isotopes
d) the number of protons

1. the unit of average atomic mass is: *

a) kg
b) g/mol
c) amu
d) j

1. what two pieces of information are needed to calculate average atomic mass? *

a) number of protons and electrons
b) mass of each isotope and percent abundance
c) atomic number and mass number
d) neutron number and proton number

Explanation:

• For question 6: The atomic mass on the periodic table is the weighted - average of the masses of all naturally - occurring isotopes of an element.
• For question 7: The unit of average atomic mass is atomic mass unit (amu).
• For question 8: To calculate the average atomic mass, we need the mass of each isotope and its percent abundance.

Answer:

1. c) The average of all isotopes
2. c) amu
3. b) Mass of each isotope and percent abundance