Chem Revision

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Last updated 8:18 AM on 2/22/25
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13 Terms

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Element
A pure substance made of only one type of atom.
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Atomic Number (Z)
Represents the number of protons in the nucleus of an atom; each element has a unique atomic number.
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Mass Number (A)
Represents the total number of protons and neutrons present in the nucleus of an atom.
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Isotopes
Atoms of the same element with the same number of protons but a different number of neutrons.
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Ions
Atoms that have gained or lost one or more electrons, resulting in a net electrical charge.
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Cations
Positively charged ions formed when an atom loses electrons.
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Anions
Negatively charged ions formed when an atom gains electrons.
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What defines an element?
An element is defined by the number of protons in its nucleus.
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How is mass number calculated?
Mass number = number of protons + number of neutrons.
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What does the atomic number indicate about an element?
It indicates the number of protons in the nucleus, making each element unique.
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Fill in the Blank: Atoms that have the same number of protons but different number of neutrons are called __________.
Isotopes.
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Fill in the Blank: A sodium ion (Na+) is an example of a __________.
Cation.
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Fill in the Blank: The total number of protons and neutrons in the nucleus of an atom is referred to as the __________.
Mass Number.