Mass number, atomic number, ions & isotopes
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Last updated 10:56 AM on 1/17/23
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5 Terms
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In an atom the **number of electrons is…**
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What is the reason for this?
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What is the reason for this?
In an atom the **number of electrons is equal to the number of protons** in the nucleus. This is because **atoms have no overall electrical charge so the negative charges on the electrons cancel out the positive charges on the protons**.
2
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What is the atomic number?
**The total number of protons** inside the atom
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What is the mass number?
**The total number of protons + neutrons** inside the atom.
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Atoms turn into what?
What causes this?
What causes this?
Atoms turn into **positive ions** if they lose **one or more outer electron(s).**
5
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What is an isotope?
Atoms of the same element that have different numbers of neutrons