Which of the Following Shows the Arrangement of Electrons in Beryllium

Multiple Choice

Which of the following shows the arrangement of electrons in beryllium (Z = 4) ? (s, p, d, f represent the sub shells and the superscript represents the number of atoms in the subshell.)

A) 1s¹2s²1p¹
B) 1s¹2s¹3p¹
C) 1s²2s¹
D) 1s²2s²
E) 1s⁰2s¹3p²