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Unit 4 QUIZ

QuestionAnswer
What is an atomic number? the number of protons and electrons
What is a mass number? the sum of the numbers of protons and neutrons in the nucleus- not on the periodic table
How many electrons does the energy level 1 hold? 2
How many electrons does the energy level 2 hold? 8
How many electrons does the energy level 3 hold? 18
How many electrons does the energy level 4 hold? 32
Location of electrons... cannot be predicted precisely
How did Mendeleev organize his periodic table? he arranged elements in rows by increasing atomic mass, was able to predict elements by having gaps, few elements did not fit
How did Mosely organize the modern periodic table? he arranged elements by the atomic number
Elements are either... metals, nonmetals, or semiconductors
Created by: haleylorenson
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