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clairajogriggsk
26.09.2019 •
Chemistry
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an atom holds 7 electrons. use orbital notation to model the probable location of its electrons.
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Ответ:
1s² 2s²2p³
Explanation:
If the atom has seven electrons, it is Element 7 (nitrogen).
In the Periodic Table, you count the electrons in all the subshells up to
No. 7.
In the first Period, you have filled the 1s level (2 electrons).
In the second Period, you have filled the 2s subshell (2 electrons) and put three electrons in the 2p subshell.
Thus, the electron configuration is
1s² 2s²2p³
Note how the superscripts tell you the number of electrons in each subshell: 2 + 2 + 3 = 7.
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