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Atoms,Periodic Table

QuestionAnswer
what does the atomic number equal number of protons
who organized the first periodic table Mendeleev
who arranged the periodic table in 1913 Henry Moseley
what elements have a lot in common same periods
how many periods are there, how many groups/families 7, 18
what is the 1st group called alkali metals
what is the 2nd family called alkaline earth metals
what is the 17th group called halogens
what is the 18th family called noble gases
what are noble gases gases that do not react well with other elements
Name 3 characteristics of metals such as cobalt shiny, solids at room temperature, good heat/electricity conductors
Name 3 characteristics of nonmetals such as oxygen usually gases at room temperature, brittle solids, DO NOT conduct heat/electricity well
synthetic element man-made element, above the atomic number 92
if a metal can be easily hammered into a shape it is called malleable
alkaline earth metals are highly reactive
transition metals are less reactive
what are metalloids have properties of metals and nonmetals
what do we call something in between a conductor and an insulator a semi-conductor
the atomic mass is the number of protons + neutrons
protons are equal to electrons
the number of neutrons is atomic mass-atomic number
Created by: Hattison13
 

 



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