What is the electron configuration for arsenic (As)?

1 Answer
anor277
Jun 16, 2018

Well, what is #Z_"atomic number"# for arsenic?

Explanation:

A quick glance at the Table (what table?, the kitchen table) tells us that #Z=33#... And if there are 33 positively-charged nuclear particles, the NEUTRAL atom must contain 33 NEGATIVELY-charged extra-nuclear particles, i.e. 33 electrons arranged according to the #"aufbau scheme"#:

#As:underbrace(1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^3)_"33 electrons as required..."#

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