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Integrated Science · Grade 9
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Atomic Number, Mass Number and Electron Arrangement — Key Terms
Match each term to its definition.
Atomic number (Z)
— match —
The number of protons in an atom; equal to electrons in a neutral atom.
The total number of protons and neutrons in the nucleus.
Found by subtracting the atomic number from the mass number (A minus Z).
A region around the nucleus where electrons are found.
The way electrons are distributed in shells, e.g. 2.8.1 for sodium.
Mass number (A)
— match —
The number of protons in an atom; equal to electrons in a neutral atom.
The total number of protons and neutrons in the nucleus.
Found by subtracting the atomic number from the mass number (A minus Z).
A region around the nucleus where electrons are found.
The way electrons are distributed in shells, e.g. 2.8.1 for sodium.
Neutron number
— match —
The number of protons in an atom; equal to electrons in a neutral atom.
The total number of protons and neutrons in the nucleus.
Found by subtracting the atomic number from the mass number (A minus Z).
A region around the nucleus where electrons are found.
The way electrons are distributed in shells, e.g. 2.8.1 for sodium.
Electron shell
— match —
The number of protons in an atom; equal to electrons in a neutral atom.
The total number of protons and neutrons in the nucleus.
Found by subtracting the atomic number from the mass number (A minus Z).
A region around the nucleus where electrons are found.
The way electrons are distributed in shells, e.g. 2.8.1 for sodium.
Electron arrangement
— match —
The number of protons in an atom; equal to electrons in a neutral atom.
The total number of protons and neutrons in the nucleus.
Found by subtracting the atomic number from the mass number (A minus Z).
A region around the nucleus where electrons are found.
The way electrons are distributed in shells, e.g. 2.8.1 for sodium.
Check