How many valence electrons are present in the element with the following ground state electron configuration? 1s² 2s² 2p³ A)2 B)3 C)5 D)7

Question

Quizplus · Accepted Answer

To determine the number of valence electrons, we only consider the electrons in the outermost shell of the atom. In this case, the outermost shell is the 3rd shell (designated by the "3" in the electron configuration). Looking at the subshells in this shell (S1, P1, S1, U1, P1), we can count the number of electrons. There are 5 electrons present, which means there are 5 valence electrons. Therefore, the answer is (C) 5.

How Many Valence Electrons Are Present in the Element with the Following