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Unit 4 QUIZ
Question | Answer |
---|---|
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 |