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24 Cards in this Set
- Front
- Back
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Atoms |
The smallest part of an element that can still be recognised as that element |
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Element |
A substance made up from only one type of atom.An element cannot be broken down chemically into any simpler substance |
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Compound |
A substance made when two or more elements are chemically bonded together |
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Mixture |
When some elements or compounds are mixed together and intermingle but do not react |
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Periodic table |
An arrangement of elements in the order of their atomic numbers forming groups and periods |
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Group |
A column on the periodic table |
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Period |
A row on the periodic table |
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Nucleus |
The central part of the atom that contains protons and neutrons |
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Electron |
A tiny particle with a negative charge, electrons orbit the nucleus of atoms or ions in shells |
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Proton |
A tiny positive particle found inside the nucleus, it has a mass of 1 |
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Neutron |
A dense particle found in the nucleus of an atom. It is neutral, carrying no charge |
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Molecule |
A grouping of two or more atoms bonded together |
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Reactant |
The substances you start a reaction with |
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Product |
The substances made from the reaction |
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Symbol equation |
An equation that uses the symbol for elements in the periodic table |
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Word equation |
An equation that uses words to name substances found in the reaction |
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More of the conservation of mass |
The total mass of the products formed in the reaction is equal to the total mass of the reactants |
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State symbol |
Added to a reactant or product tell you whether or not a substance is solid, liquid, gas or aqueous |
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Atomic number |
The amount of protons found in the nucleus for that particular element |
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Ion |
When an electron is gained or lost from an atom |
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Isotope |
When the number of electrons and protons for an element is the same but the neutrons have changed |
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Shell |
Electrons are arranged around the nucleus going up in energy per shell |
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Electronic structure |
The arrangement of electrons around the nucleus. There are two electrons in the first shell, and 8 in every shell after that |
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Noble gas |
Gases that always have a full outer shell of electrons. |
