The atom with the electron configuration 1s22s22p63s23p63d104s24p4 is in?

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