Chemistry & Periodic Table
Models of the atom & the periodic table
Terms in this set (36)
uncharged particle in the nucleus of an atom.
number of protons plus neturons in the nucleus of an atom of an element
number of protons in the nucleus of an atom of an element
matter that is made up of only one kind of atom
region surrounding the nucleus in which the electrons move about
negatively charged, almost massless, subatomic particle located outside the nucleus of an atom
amount of time required for half a sample of a radioactive isotope to decay
atoms of the same element with the same number of protons but different number of neutrons
positively charge particle located in the nucleus of all atoms
mass of the mixture of the isotopes for an element
silvery solids with low densities & low melting points found in group/column 1
alkaline earth metals
metallic elements in group/column 2 of the periodic table which are harder than the alkali metals and are also less reactive
a term used to describe a material that can be pulled out into a long wire
a vertical column of elements in the periodic table; elements in a group share chemical properties
elements located in group/column 17 which form salts
able to be hammered into thin sheets
any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
elements that show properties of both metals & nonmetals
elements located in group/column 18 which are the most chemically inactive group on the periodic table
elements that are gases or brittle solids and poor conductors of heat & electricity
row of elements in the periodic table whose properties change gradually and are predictable
elements in groups 3 - 12 in the periodic table, all of which are metals
first model of the atom as a hard sphere, like a marble, solid throughout
discovered the electron,cathode ray tube experiment, blueberry muffin model
beta particle gold foil experiment and credited with the discovery of the proton and the nucleus.
published first periodic table and organized the elements by increasing atomic mass.
smallest component of an element having the chemical properties of the element. Composed of proton, neutrons, & electrons but most of the atom is empty space.
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