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34 Cards in this Set

  • Front
  • Back
alkali metals
elements in group 1A except hydrogen, soft shiny metals with one outer shell electron
Alkali earth metals
Group 2A elements, which have 2 electrons in the outer most shell
The smallest particle of an element that retains the characteristics of the element
Atomic Mass
The weighted average of all the natural occuring isotopes of an element.
Atomic Mass Unit
A small mass unit used to describe the mass of very small particles such as atoms and subatomic particles; 1 AMU is equal to one-twelfth the mass of a C atom
Atomic number
a number that is equal to the number of protons in an atom
atomic symbol
an abbreviation used to indicate the mass number and atomic number of an isotope
A pure substance consisting of two or more elements, with a definite composition, that can be broken down into simpler substances by chemical methods.
a negatively charged subatomic particle having a very small mass that is usually ignored in calculations its symbol is e-
Electron-dot symbol
the representation of an atom that shows valence electrons as dots around the symbol of the element
a pure substance that cannot be seperatedinto any simpler substances by chemical methods
A vertical column in the periodic table that contains elements having similar physical and chemical properties
group number
a number that appears at the top of each vertical column in the periodic table and indicates the number of valence electrons in the outer most energy level
Group 7a elements
ie. fluorine, chlorine, bromine, iodine, and astatine
heterogeneous mixture
a mixture of two or more substances that are not mixed uniformly
homogeneous mixture
a mixture of two or more substances that are mixed uniformly
ionization energy
the energy needed to remove the least tightly bound electron from the outermost energy level of an atom
an atom that differs only in mass number from another atom of the same element. Isotopes have the same atomic number ( number or protons) but different number of neutrons
mass number
the total number of neutrons and protons in the nucleus of an atom
Anything that has a mass and occupies space
an element that is shiny, malleable, ductile, and a good conductor of heat and electricity. The metals are located to the left of the zig zag line
elements with the properties of both metals and non metals located along the zig zag line
the physical combination of two or more substances that does not change the identities of the mixed substances
a neutral subatomic particle having a mass of 1 amu and found in the nucleus. symbol n or n0
noble gas
an element in group 8A, generally unreactive and seldom found in the combination with other elements
an element with little or no luster that is a poor conductor of heat and electricity. located on the right of zig zag line
the compact, very dense center of an atom, contains the protons and neutrons
the region arond the nucleus where electrons of a certain energy are most likly to be found
s orbital is sphere
p orbital is 2 lobed
horizontal row in periodic table
physical properities
shape, color, density, taste, odor, hardness, melting point, and boiling point
a positivly charged subatomic particle having a mass of 1 AMU and found in the nucleus of an atom.
pure substance
a type of matter with a fixed composition; elements and compounds
subatomic particles
a particle within an atom; protons, neutrons and electrons
valence electrons
electrons in the outermost energy level of an atom