1s22s22p63s23p63d104s24p4
A. period 4, p- block
B. period 3, p- block
C. period 4, d- block
D. period 3, d- block
Correct Answer:
Option A – period 4, p- block
Explanation
Selenium is a chemical element with the symbol Se and atomic number 34. It is a non-metal
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