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Chemistry Vocabulary

Alkali metals The chemical elements in Group 1 of the periodic table
Alkaline earth metals The alkaline earth metals are six chemical elements in group 2 of the periodic table.
Atom The basic unit of a chemical element
Atomic mass The mass of an atom of a chemical element shown in atomic mass units.
Atomic mass unit (amu) A unit of mass used to express atomic and molecular weights
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
Atomic orbitals A mathematical function that describes the wave-like behavior of either one electron/pair of electrons in an atom
Atomic radius The atomic radius of a chemical element is a measure of the size of its atoms,
Electron configuration The distribution of electrons of an atom or molecule in atomic or molecular orbitals
Electronegativity Electronegativity is a measure of the tendency of an atom to attract a bonding pair of electrons.
Electrons An electron is a negatively charged subatomic particle.
Energy levels The fixed amount of energy that a system described by quantum mechanics, such as a molecule, atom, electron, or nucleus, can have.
Ground state The lowest energy state of an atom or other particle.
Group The columns in a periodic table are groups.
Halogens Any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA (17)
Ionization energy The ionization energy (IE) is qualitatively defined as the amount of energy required to remove the most loosely bound electron
Isotopes If an atom is missing and a neutron has an extra neutron that is a n isotope
Mass Number The number of protons and neutrons in a nucleus
Metalloids Element whose properties are between metals and solid nonmetals
Metals Any chemical element that is an effective conductor of electricity and heat can be defined as a metal.
Neutrons Neutrons are the particles in an atom that have a neutral charge
Noble gases The gaseous elements helium, neon, argon, krypton, xenon, and radon, occupying Group 0 (18)
Nonmetals An element or substance that is not a metal.
Nucleus The center part in an atom that contains protons and neutrons
Periodic table A table of the chemical elements in order of atomic number
Periods Periods in the periodic table are the horizontal rows
Photons A particle representing a quantum of light or other electromagnetic radiation
Protons A positively charged subatomic particle.
Representative elements The elements within the first two families and the last six families or groups
Transition metals All the transition metals have two electrons in their outermost shell
Created by: Sharon20