The atom with the electron configuration
1s2...
The atom with the electron configuration
1s22s22p63s23p63d104s24p4 is in
period 4, p- block
period 3, p- block
period 4, d- block
period 3, d- block
Correct answer is A
Selenium is a chemical element with the symbol Se and atomic number 34. It is a non-metal
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