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Phys Sci-Chap 4 & 5

vocab words

QuestionAnswer
nucleus dense, positively charged mass located in the center of an atom
proton positively charged subatomic particle that is found in the nucleus of an atom
electron negatively charged subatomic particle that is found in the space outside the nucleus of an atom
neutron neutral subatomic particle that is found in the nucleus of the atom
atomic number unique number for each element that equals the number of protons in an atom of that element
mass number the sum of the number of protons and neutrons in the nucleus of an atom
isotopes atoms of a given element that have different numbers of neutrons and different mass numbers
energy levels the possible energies that electrons in an atom can have
electron cloud a visual model of the most likely locations for the electrons in an atom
orbital a region of space around the nucleus where an electron is likely to be found
electron configuration the arrangement of electrons in the orbitals of an atom
ground state a state in which all the electrons in an atom have the lowest possible energies
periodic table an arrangement of elements in columns, based on a set of properties that repeat from row to row
period a row in a periodic table of elements
group a column of elements in a periodic table
periodic law the pattern of repeating properties displayed by elements in the periodic table
atomic mass unit (amu) one twelfth the mass of a carbon-12 atom
metals elements that are good conductors of heat and electric current
transition metals elements that form a bridge between elements on the left and right sides of the periodic table
nonmetals elements that are poor conductors of heat and electric currents
metalloids elements with properties that fall between those of metals and nonmetals
valence electrons an electron that is in the highest occupied energy level of an atom
alkali metals the elements in Group 1A of the periodic table, not including hydrogen
alkaline earth metals the elements in Group 2A of the periodic table
halogens the elements in Group 7A of the periodic table
noble gases the elements in Group 8A of the periodic table
Created by: msparks