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.)

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Beryllium has an atomic number of 4, indicating it has 4 electrons. The electron configuration of beryllium is 1s2 2s2, where the superscripts indicate the number of electrons in each subshell. Choice D correctly shows the arrangement of these electrons, with 1s2 in the first shell and 2s2 in the second shell. The other choices either have incorrect subshells or an incorrect number of electrons in each subshell.

Which of the Following Shows the Arrangement of Electrons in Beryllium