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chapter 12 ps

QuestionAnswer
define atom The smallest particle into which an element can be divided and still be the same substence
define isotope an atom that has the same nuber of protton as other atoms of the same element do but that has a different number of neutrons and therefor a differet mass number
define ion a charged particle that forms when and atom or group of atoms gains (negative) or loses (positive) one or more electrons
the mass number equals the total number of protons,neutrons
define electron a subatomic particle that has a negative charge and surrounds the nucleus.Discoverd by thomson
define neutron a subatomic particle that had no charge and is found in the nucleus of an atom
define proton a subatomic particle that has a positive charge and that is found in the nucleus of an atom
what is the electron cloud a region around the nucleus of an atom where electrons are likely to be found
define nucleus an atoms central region which is made up of protons and neutrons
how did mendeleev arrange the periodic table he arranged the elements in order of increasing atomic mass
peridoic means happing at regular intervals
what does the periodic law state that the repeating chemical and physical properties of elements change periodically with the elements atomic number
Vertical columns on the periodic table are called groups or families
horizontal rows (lef to right) on the periodic table are called periods
what is affected by the location of an element within a period physical and chemical properties
were are metals located on the peridoc table to the left of the sigzag line
were are metalloids located on the peridoc table on the zigzag line
were are nonmetals located on the peridoc table to the right of the zigzagline
what are some properties of metal shiny,ductile,malleable and good conductors
what are some properties of nonmetals dull and brittle if soilds, not malleable, ductile
how is physical state of an element represented on many periodic tables the color of the chemical symbol
how is the modern peridoic table arranged in order of increasin atomic number of the number of protons
how many naturally accurring elements are there on earth 91
were is the mass number located for each element of the perioic table what dose the number represent at the bottom of each elements square; the total number of protons and neutrons in a neutral atom of that element
were is the lanthanides group on the peridoc table at the bottom first row and is made up of shiny and reactive metals
were is actinides gruop on the peridoc table at the bottom secend row and is made up of radioactive or unstable things
what is the most abundant element in the univers hydrogen
where are the transition metals located groups 3-12 on the periodic table; tend to be shiny and coduct thermal energy and electric current
carbon family it is a nonmetal and can be found uncombined in nature it has 4 valence electrons
halogens nonmetals with 7 valence electrons; very reactive poor conductors
alkali metals metals with 1 valence electron group #1 most reactive metals because they easily give away one outer level electron
alkali earth metals metals with 2 valence electrons group # 2 less reactive tha alkali metals
the first energy level of an atom can hold up to _____ electrons 2
the second energy level can hol up to _____ electrons 8
define valence electrons an electrons that is foun in the outermost shell of an atom and that determines the atoms chemical properties
Created by: rountree8
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