Mass Number and Isotopes
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21 Terms
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What is the mass number?
the total number of protons and neutrons
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What is the atomic number?
the number of electrons
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What does the total number of protons and neutrons form?
the mass number
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What does the total number of electrons form?
the atomic number
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What is the number of electrons equal to?
To the number of protons
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What is the number of protons equal to?
To the number of electrons
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What are ions?
They are atoms that have the same number of neutrons and protons but have lost or gained electrons.
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What are isotopes?
They are atoms that have the same number of protons and electrons but a different number of neutrons.
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What is the difference between ions and isotopes?
Ions have a different number of electrons but isotopes have a different number of neutrons.
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Why do isotopes have the same atomic number?
Because the number of electrons and neutrons remain unchanged.
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Why do isotopes have different mass numbers?
Because they have different numbers of neutrons.
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How does isotopes having different number of neutrons affect the mass numbers?
The mass number is different for each isotope.
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How does isotopes having the same number of protons affect the atomic number?
The atomic number remains the same.
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What are atoms that have lost electrons called?
Ions
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What are atoms that have gained electrons called?
Ions
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What are atoms that have a different number of neutrons called?
Isotopes
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Why do ions have the different atomic number?
Because they have different numbers of electrons.
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Why do ions have same mass numbers?
Because they have the same number of protons and neutrons.
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How do you write the symbol of an isotope?
The chemical symbols, then a dash, followed by the mass number.
e.g. carbon-12 and carbon-14
e.g. carbon-12 and carbon-14
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Why do isotopes of the same element display the same chemical characteristics?
This is caused by isotopes having the same number of electrons in the orbitals.
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Why do isotopes of the same element display different physical properties.
This is caused by the different number of neutrons, which alter the mass of the atom.
Note 
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