Atomic Structure & Periodic Table

Question 1

Relative Atomic Mass (Ar)

Answer 1

Weighted mean mass of an atom of an element relative to 1/12th of the mass of an atom of Carbon-12.

Question 2

Weighted Mean Mass

Answer 2

Takes into account:

   - Percentage of abundance of each isotope.
   - Relative isotopic mass of each isotope.

Question 3

Relative Isotopic Mass

Answer 3

Mass of each isotope relative to 1/12th of the mass of an atom of Carbon-12.

Question 4

amu

Answer 4

Atomic Mass Unit (sometimes used for Ar).

Question 5

Finding Atomic Mass

Answer 5

(mass1 x X%1) + (mass2 x X%2) + …

Question 6

Atomic Number

Answer 6

Number of protons in the nucleus of an atom.

Question 7

Mass Number

Answer 7

Number of protons and neutrons in the nucleus of an atom.