(a) write the ground state electron configuration for an arsenic atom, showing the number of electrons in each subshell
(b) give one permissible set of four quantum numbers for each of the outermost electrons in a single as atom when it is in its ground state.
(c) is an isolated arsenic atom in the ground state paramagnetic or diamagnetic? explain briefly.
(d) explain how the electron configuration of the arsenic atom in the ground state is consistent with the existence of the following known compounds: na3as, ascl3, and asf5. 978 d

Paramagnetic

Explanation:

The details of the answers to the questions are written in the image attached.

Arsenic is in group fifteen having a valency of 3 or 5 depending on the number of valence electrons used in bond formation. All the electrons have the same spin in obedience to Hunds rule. The 4s electrons are lone pairs localized on the arsenic atom which could sometimes also participate in bonding.

the answer is:  

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