Answer:-
To find the number of 3d electrons in an arsenic atom, look at its electron configuration: 1 ???? 2 2 ???? 2 2 ???? 6 3 ???? 2 3 ???? 6 3 ???? 10 4 ???? 2 4 ???? 3 1s 2 2s 2 2p 6 3s 2 3p 6 3d 10 4s 2 4p 3 . The 3d subshell is fully filled with 10 electrons. This is because arsenic, with an atomic number of 33, follows the Aufbau principle, filling lower energy subshells (like 3d) before moving to higher ones (like 4s and 4p). Therefore, in an arsenic atom, the 3d subshell contains 10 electrons.
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