Question

how is the \average atomic mass\ different from the \mass number\? select all that apply a average atomic mass is listed on the periodic table. b average atomic mass takes into account the abundance of different isotopes c mass number will always have a decimal place d average atomic mass may have a decimal e mass number takes into account the abundance of different isotopes

Explanation:

• Option A: The periodic table lists the average atomic mass of elements, so this is correct.
• Option B: Average atomic mass is calculated by considering the mass and relative abundance of each isotope of an element, so this is correct.
• Option C: Mass number is the sum of protons and neutrons in an atom's nucleus, so it's a whole number (no decimal), so this is incorrect.
• Option D: Since average atomic mass is a weighted average of isotopic masses, it can have a decimal (e.g., carbon's average atomic mass is ~12.01), so this is correct.
• Option E: Mass number is specific to a single isotope (sum of protons and neutrons) and does not consider isotope abundance, so this is incorrect.

Answer:

A. Average atomic mass is listed on the periodic table.
B. Average atomic mass takes into account the abundance of different isotopes
D. Average atomic mass may have a decimal