Atomic structure - Topic 1 Edexcel A Level
Chemistry 2024
Atomic mass - Number of protons and neutrons in the nucleus of an atom
Atomic number - Number of protons in the nucleus of an atom
Isotopes - - Atoms with the same number of protons and a different number of
neutrons
- Atoms with the same atomic number but different atomic mass
- They have similar chemical reactivity as they have the same number of electrons
in the outer shell
Ion - An atom or group of atoms that have lost or gained an electron
Periodicity - The repeating pattern of chemical and physical properties of the
elements across a period
Mass spectrometry - An analytical method that measures the relative abundance
of different isotopes in a sample by measuring their masses.
, Atomic structure - Topic 1 Edexcel A Level
Chemistry 2024
The y-axis is the relative abundance and the x-axis is the m/z ratio.
Ions with a charge of 1+ are formed.
m/z ratio - - Mass to charge ratio
- This is equal to the mass for ions with a charge of 1+
Emission specrum - The pattern of lines seen on photographic film when a sample
is heated and the light emitted is passed through a prism.
Each element has its own emission spectrum. Some of the lines may may not be in
the visible region.
How is an emission spectrum produced? - 1. Electrons absorb energy and so
become excited.
2. They move from a low energy ground state close to the nucleus to a high
energy state further away from the nucleus.
Chemistry 2024
Atomic mass - Number of protons and neutrons in the nucleus of an atom
Atomic number - Number of protons in the nucleus of an atom
Isotopes - - Atoms with the same number of protons and a different number of
neutrons
- Atoms with the same atomic number but different atomic mass
- They have similar chemical reactivity as they have the same number of electrons
in the outer shell
Ion - An atom or group of atoms that have lost or gained an electron
Periodicity - The repeating pattern of chemical and physical properties of the
elements across a period
Mass spectrometry - An analytical method that measures the relative abundance
of different isotopes in a sample by measuring their masses.
, Atomic structure - Topic 1 Edexcel A Level
Chemistry 2024
The y-axis is the relative abundance and the x-axis is the m/z ratio.
Ions with a charge of 1+ are formed.
m/z ratio - - Mass to charge ratio
- This is equal to the mass for ions with a charge of 1+
Emission specrum - The pattern of lines seen on photographic film when a sample
is heated and the light emitted is passed through a prism.
Each element has its own emission spectrum. Some of the lines may may not be in
the visible region.
How is an emission spectrum produced? - 1. Electrons absorb energy and so
become excited.
2. They move from a low energy ground state close to the nucleus to a high
energy state further away from the nucleus.
