Chem Vocab
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Alkaline Earth Metal | one of the elements of Group 2 of the periodic table
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| Period | a horizontal row of elements in the periodic table
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| Subatomic Particles | matter smaller than an atom
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| Compound | a substance made up of atoms of two or more different elements joined by chemical bonds
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| Neutron | a subatomic particle that has no charge and that is found in the nucleus of an atom
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| Reactivity | a measure of how readily an element will combine with another element to form a compound
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| Dalton | the scientist who developed the first scientifically based theory of the atom; his theory had five postulates
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| Nucleus | an atom's central region
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| Diatomic Elements | 7 elements that always occur in pairs in nature; HONClBrIF
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| Bohr | the scientist responsible for the Solar System model of the atom: the first person to place electrons into energy levels
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| Noble Gases | unreactive elements of Group 8A of the periodic table
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| Groups | a vertical column of elements in the periodic table that share chemical properties
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| Rutherford | scientist who discovered that the atom is mostly empty space and has a small, dense nucleus
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| Element | a substance that cannot be separated or broken down into simpler substances by chemical means.
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| Inner Core Electrons | electrons that do not participate in chemical reactions
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| Mass Number | the sum of the numbers of protons and neutrons in the nucleus of an atom
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| Halogens | one of the elements of Group 7A of the periodic table
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| Alkali Metals | one of the elements of Group 1 of the periodic table
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| Isotope | an atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons
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| Oxidation Number | equivalent to the charge on an atom or ion
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| Ion | an atom that has gained or lost one or more electrons and has a negative or positive charge
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| Electron | a subatomic particle that has a negative charge
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| Thomson | scientist who discovered the electron and developed the 'Plumb Pudding Model" of the atom
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| Molar Mass | the sum of the atomic masses of all of the elements in a compound
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| Democritus | ancient philosopher who coined the term "atomos"
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| Polyatomic Ions | an ion made of two or more atoms
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| Atomic Number | the number of protons in the nucleus of an atom
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| Energy Levels | where electrons were placed in the solar system model
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| Atomic Mass | the mass of an atom expressed in atomic mass units
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| Valence | outer level of electrons that participate in reactions
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| Orbitals | according to the modern theory, a region in an atom where there is a high probability of finding electrons.
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| Proton | a subatomic particle that has a positive charge and is found in the nucleus of an atom
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| Atom | the smallest unit of an element that maintains the properties of that element
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