2.1.1 Atomic structure and Isotopes Flashcards
What is an isotope?
An isotope is atoms of the same element with the same number of protons but different numbers of neutrons and, therefore different masses.
Isotopes have …
Different physical properties but similar chemical properties
Why do isotopes have different physical properties
Isotopes have different masses resulting in different physical properties
Why do isotopes have similar chemical properties?
Isotopes have the same electronic structures (Chemical reactions always depend on electrons!)
What is the definition of relative atomic mass?
The weighted mean mass of an atom compared to 1/12 of the mass of a
carbon-12 atom
What is the definition of relative isotopic mass?
The mass of an isotope compared to 1/12 of the mass of a carbon-12 atom
What is the definition of relative molecular mass?
The average mass of a molecule compared to 1/12 of the mass of a carbon-12 atom
3 sub-atomic particles?
Protons
Electrons
Neutrons
Charge of an electron?
-1
Mass of an electron?
1/1836
Charge of a proton?
+1
Mass of a proton?
1
Charge of a neutron?
0
Mass of a neutron?
1
Where are electrons found in an atom?
Orbitals
Where are Protons and neutrons found in an atom?
Nucleus
What is mass spectrometry?
An apparatus that determines the mass of a molecule or isotope by comparing the mass: charge ratio by causing substances to have positive ions.
It allows you to find an unknown compound or a relative abundance
RAM formula?
100
