Isotopes and relative atomic mass Flashcards
1
Q
What is the definition of isotopes?
A
Atoms of the same element with different numbers of neutrons and different masses
2
Q
What do isotopes have the same?
A
Atomic number
3
Q
What do isotopes have different?
A
Mass number
4
Q
What is the definition of the relative atomic mass (Ar)?
A
Weighted mean mass of an atom of the element compared with 1/12th mass of an atom of carbon 12, which has a mass of 12g
5
Q
What is the definition of the relative isotopic mass?
A
Mass of an isotope compared with 1/12th mass of an atom of carbon 12, which has a mass of 12g
6
Q
What is the formula for calculating the relative atomic mass?
A
Ar = (% abundance x relative isotopic mass) + (% abundance x relative isotopic mass) / 100
