An element with the electron configuration [noble gas]ns²(n - 1)d¹⁰np³ has ____________ valence electrons. A)2 B)3 C)5 D)10 E)15

Question

Quizplus · Accepted Answer

The valence electrons are the outermost electrons of an atom, which determine its chemical properties and are involved in chemical bonding. To determine the number of valence electrons in this element, we need to look at the electron configuration of the outermost shell (highest value of n). In the given electron configuration, the outermost shell is np³, which contains a total of 5 valence electrons (one electron in np, three electrons in n+1d, and one electron in ns orbitals). Therefore, the correct answer is C)5.

An Element with the Electron Configuration [Noble Gas]ns2(n - 1)d10np3

An Element with the Electron Configuration [Noble Gas]ns²(n - 1)d¹⁰np³