Chemistry
NOakes
2016-04-09 14:54:57
Determine the number of 3s electrons in na.
ANSWERS
mfgreencgtc1
2016-04-09 21:26:43

Use the atomic number (Z) of the element and determine the electron configuration. Z for Na is 11 => 11 electrons. => electron configuration = 1s2 2s2 2p6 3s So, there you can count 5 s electrons: 2 in 1s, 2 in 2s and 1 in 3s). The questions asks only for the 3s electrons, so the answer is one 3s electron.

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