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28 Cards in this Set
- Front
- Back
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Atom |
Is a basic unit of matter and is the smallest particle of an element. |
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Molecule |
a particle consisting of two or more atoms chemically bonded together. |
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Element |
Are pure substances which only consists of one type of atom. |
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Compound |
Are pure substances which consists of two or more different elements chemically combined in a fixed ratio. |
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Atomic number |
isthe number of protons in the nucleus of an atom of that element. |
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Mass number |
is the number of protons plus the numberof neutrons in the nucleus of an atom. |
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Ion |
is an atom or group of atoms that have an electric charge. |
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Polyatomic Ion |
is a group of atoms bonded together that has gained or lost electrons and behaves like a single unit in chemical reactions. |
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Symbol |
Is the one or two letter that represents an element on the periodic table. |
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Formula |
formula tells us the number of atoms of each element in a compound. |
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Metal |
Element located on the left side of the periodic table (with the exception of hydrogen) |
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Non-metal |
Element located on the right side of the periodic table |
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Proton |
positively charged atom in the nucleus |
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electron |
negatively charged atom in the electron cloud |
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Neutron |
neutraly charged atom in the nucleus |
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Nucleus |
The central part of an atom that contains the protons and neutrons |
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Energy level |
The levels of energy in the electron cloud |
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Electron configuration |
Eachenergy level can accommodate a maximum number of electrons. Each energylevel fills the “seats” closest to nucleus first. |
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Valence Electron |
the amount of electrons of the outermost shell of the electron cloud |
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Periodic table |
The periodic table is the arrangement of the chemical elements, ordered by their atomic number and electron configuration. |
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Chemical equation |
A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formulae |
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Reactant |
The substance that undergoes change during a reaction |
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Product |
is the substance that is formed when to or more chemicals react |
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Covalent bond |
When two non metals exchange electrons |
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ionic bond |
when a metal and a non metal exchange electrons |
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Physical change |
A PHYSICAL CHANGE does not producea change in the chemical composition or the identity of the substances.Thus,no new substances are formed. |
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Chemical change |
A CHEMICAL CHANGE occurs when newsubstances are formed.Energyis either absorbed or released as a chemical reaction takes place. |
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Chemical reaction |
Involves the rearrangement of atoms from the reactant stage to the product stage |
