Question

average atomic mass 1. the ptoe does not list ____ numbers or numbers of __. 2. each element may have __ isotopes. the decimal number on the periodic table represents the __. 3. average atomic mass is based on: __ 4. the average atomic mass of carbon = __ carbon has __ isotopes. the mass number on the ptoe is an ____ of these three.

Explanation:

1. The periodic table (PTOE) lists average atomic masses, not whole mass numbers of individual isotopes.
2. Elements can have multiple isotopes, which are atoms of the same element with different neutron counts; the decimal value is the weighted average of these isotopes' masses.
3. Average atomic mass is defined relative to the mass of carbon-12, set as 12 atomic mass units.
4. The given text states carbon's average atomic mass is 12.01.
5. The text explicitly states carbon has three isotopes, and the periodic table value is an average of their masses weighted by abundance.

Answer:

1. whole; individual isotopes
2. multiple; weighted average of the masses of an element's isotopes
3. the mass of carbon-12 (set to 12 amu)
4. 12.01
5. three; average