Chemistry Vocabulary
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| Alkali metals | The chemical elements in Group 1 of the periodic table
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| Alkaline earth metals | The alkaline earth metals are six chemical elements in group 2 of the periodic table.
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| Atom | The basic unit of a chemical element
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| Atomic mass | The mass of an atom of a chemical element shown in atomic mass units.
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| Atomic mass unit (amu) | A unit of mass used to express atomic and molecular weights
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| Atomic Number | The number of protons in the nucleus of an atom,it shows the chemical properties of an element and where it's at in the periodic table
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| Atomic orbitals | A mathematical function that describes the wave-like behavior of either one electron/pair of electrons in an atom
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| Atomic radius | The atomic radius of a chemical element is a measure of the size of its atoms,
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| Electron configuration | The distribution of electrons of an atom or molecule in atomic or molecular orbitals
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| Electronegativity | Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.
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| Electrons | An electron is a negatively charged subatomic particle.
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| Energy levels | The fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have.
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| Ground state | The lowest energy state of an atom or other particle.
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| Group | The columns in a periodic table are groups.
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| Halogens | Any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17)
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| Ionization energy | The ionization energy (IE) is qualitatively defined as the amount of energy required to remove the most loosely bound electron
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| Isotopes | If an atom is missing and a neutron has an extra neutron that is a n isotope
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| Mass Number | The number of protons and neutrons in a nucleus
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| Metalloids | Element whose properties are between metals and solid nonmetals
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| Metals | Any chemical element that is an effective conductor of electricity and heat can be defined as a metal.
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| Neutrons | Neutrons are the particles in an atom that have a neutral charge
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| Noble gases | The gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18)
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| Nonmetals | An element or substance that is not a metal.
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| Nucleus | The center part in an atom that contains protons and neutrons
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| Periodic table | A table of the chemical elements in order of atomic number
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| Periods | Periods in the periodic table are the horizontal rows
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| Photons | A particle representing a quantum of light or other electromagnetic radiation
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| Protons | A positively charged subatomic particle.
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| Representative elements | The elements within the first two families and the last six families or groups
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| Transition metals | All the transition metals have two electrons in their outermost shell
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