Platforms
Make a Li atom with a mass number of 7. How many electrons did you place in the outermost orbital (ring)?
B
40
Use the periodic table to determine which of the following could be an isotope of indium (In). Check all that apply.
C =
Make a N atom with a mass number of 14. How many neutrons are in the nucleus?
C
Ca
Make a B atom with a mass number of 11. How many electrons did you put in the second orbital (ring)?
D
10
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Atomic Numbers and Electron Configurations
The History and Arrangement of the Periodic Table
Periodic Trends