Isotopes and Ar Flashcards
1
Q
Define isotopes
A
Atoms with the same number of protons but a different number of neutrons.
2
Q
Describe the chemical and physical properties of isotopes
A
The same chemical properties (as they have the same no. of e-)
Slightly different physical properties e.g mass & melting point
3
Q
Define Ar
A
The average relative atomic mass of an atom of an element compared to 12C having a mass of 12g.
4
Q
What is Ar
A
An average (mean) of an element's isotopic masses. The mass no. on the periodic table.
5
Q
Give the formula to calculate Ar
A
(Mass no. of the element’s isotopes x their respective percentage abundancies)/100
6
Q
Define atom
A
smallest particle still characterising a chemical element
7
Q
Define ion
A
A charged particle formed when atoms gain or lose e- from their outer shells.
